Sellers:

http://www.tf2outpost.com/trade/29206194 - b/o: 21 keys (1 day)

Sold:

https://marketplace.tf/items/30810;5;u107 - sold for $45 = 21 keys, and $59.99 = 28 keys (outlier)

http://backpack.tf/profiles/76561198093845815#!/compare/1492819200/1493424000

http://backpack.tf/profiles/76561198289638702#!/compare/1492646400/1493251200 - scm

http://backpack.tf/profiles/76561198079395271#!/compare/1476576000/1493942400 - ?

http://backpack.tf/profiles/76561198264905335#!/compare/1491782400/1491868800 - sold for Purple Confetti Frenchman's Beret (17) + Strange Professional Killstreak Australium Force-A-Nature (12) = 29 keys (outlier)

http://backpack.tf/profiles/76561198254212752#!/compare/1491523200/1491609600 - sold for Strange Specialized Killstreak Australium Sniper Rifle (24) = 24 keys

http://backpack.tf/profiles/76561198006572847#!/compare/1491436800/1491523200

http://backpack.tf/profiles/76561198254212752#!/compare/1491436800/1491523200 - ?

http://www.tf2outpost.com/trade/28909117

http://backpack.tf/profiles/76561198165239338#!/compare/1494547200/1494633600 - sold with 7 keys for Miami Nights Troublemaker's Tossle Cap (28) = 21 keys

http://backpack.tf/profiles/76561198156379159#!/compare/1493942400/1494028800 - sold for Starstorm Slumber Nasty Norsemann (23) = 23 keys

http://www.tf2outpost.com/trade/28907475

http://backpack.tf/profiles/76561198076453268#!/compare/1493856000/1493942400 - sold for 19 keys + metal = 20 keys (quicksold)

http://backpack.tf/profiles/76561198080669489#!/compare/1493769600/1493856000

http://backpack.tf/profiles/76561198076453268#!/compare/1493596800/1493769600 - ?

http://backpack.tf/profiles/76561198342161127#!/compare/1493683200/1493769600 - ?

http://www.tf2outpost.com/trade/29179002

http://backpack.tf/profiles/76561198126835242#!/compare/1494633600/1494720000

http://backpack.tf/profiles/76561198190068633#!/compare/1494720000/1494806400 - sold for Kill-a-Watt Lucky Shot (21) + Strange Professional Killstreak Gold Botkiller Rocket Launcher Mk.I + sweets = 21 keys b/o

http://backpack.tf/profiles/76561198123364734#!/compare/1494201600/1494633600

http://backpack.tf/profiles/76561198126835242#!/compare/1494547200/1494633600 - sold for Stormy Storm Airdog + 4 keys = 20 keys

http://backpack.tf/profiles/76561198044557428#!/compare/1493856000/1494028800

http://backpack.tf/profiles/76561198123364734#!/compare/1493856000/1494028800 - scm

http://backpack.tf/profiles/76561198072386437#!/compare/1493683200/1493856000

http://backpack.tf/profiles/76561198044557428#!/compare/1493683200/1493856000 - bulk

http://www.tf2outpost.com/trade/29200641

http://backpack.tf/profiles/76561198048008254#!/compare/1496016000/1496102400

http://backpack.tf/profiles/76561198365476789#!/compare/1495929600/1496102400 - sold for 18 keys (quicksold)

http://backpack.tf/profiles/76561198133538209#!/compare/1495929600/1496016000

http://backpack.tf/profiles/76561198048008254#!/compare/1495929600/1496016000 - ?

http://backpack.tf/profiles/76561198054601655#!/compare/1490572800/1490659200 - sold for 19 keys (quicksold)

http://backpack.tf/profiles/76561198292156436#!/compare/1490400000/1490572800 - ?

http://www.tf2outpost.com/trade/29061611

http://backpack.tf/profiles/76561198088232579#!/compare/1494201600/1494720000 - sold for Haunted Phantasm Jr Slick Cut (38) + sweets (1) = 39 keys (outlier)

http://backpack.tf/profiles/76561198026577539#!/compare/1490313600/1490400000 - bulk

http://backpack.tf/profiles/76561198088656972#!/compare/1492646400/1492992000

http://backpack.tf/profiles/76561198167890568#!/compare/1492819200/1493078400 - scm

http://backpack.tf/profiles/76561198088656972#!/compare/1492128000/1492300800 - ?

http://backpack.tf/profiles/76561198169224604#!/compare/1490572800/1492214400 - ?

http://backpack.tf/profiles/76561198034309290#!/compare/1492387200/1492819200 - scm

http://backpack.tf/profiles/76561198344933095#!/compare/1492300800/1492387200

http://backpack.tf/profiles/76561198251960730#!/compare/1492387200/1492473600 - sold for 20 keys + 41 ref = 21 keys

http://www.tf2outpost.com/trade/28907543

http://backpack.tf/profiles/76561198127367498#!/compare/1493856000/1494028800

http://backpack.tf/profiles/76561198171991185#!/compare/1493596800/1494028800 - sold for 9 keys + bunch of items (19) = 25 keys b/o

http://backpack.tf/profiles/76561198135951468#!/compare/1493337600/1493510400

http://backpack.tf/profiles/76561198127367498#!/compare/1493337600/1493424000 - sold for 25 keys

http://www.tf2outpost.com/trade/28885487

http://backpack.tf/profiles/76561198048008254#!/compare/1492646400/1492732800

http://backpack.tf/profiles/76561198135951468#!/compare/1492646400/1492905600 - sold for 21 keys

http://backpack.tf/profiles/76561198202094888#!/compare/1489968000/1492732800 - scm

http://backpack.tf/profiles/76561198056665335#!/compare/1492560000/1492646400

http://backpack.tf/profiles/76561198146690947#!/compare/1491868800/1492732800 - ?

http://backpack.tf/profiles/76561198048008254#!/compare/1492473600/1492560000 - sold for 12 keys + ?

http://backpack.tf/profiles/76561198151005351#!/compare/1492387200/1492473600 - sold for 18 keys (low)

http://backpack.tf/profiles/76561198242464834#!/compare/1490832000/1494892800

http://backpack.tf/profiles/76561198124550941#!/compare/1490832000/1491523200 - backpack purchase

http://backpack.tf/profiles/76561198015299671#!/compare/1495843200/1495929600 - sold for Starstorm Slumber Toy Soldier (21) = 21 keys

http://www.tf2outpost.com/trade/29200641

http://backpack.tf/profiles/76561198048008254#!/compare/1495756800/1495843200

http://backpack.tf/profiles/76561198015299671#!/compare/1495670400/1495843200 - sold for Starstorm Insomnia Modest Metal Pile of Scrap = 28 keys (outlier)

http://backpack.tf/profiles/76561198048008254#!/compare/1495584000/1495670400 - ?

http://backpack.tf/profiles/76561198079578383#!/compare/1494028800/1494115200

http://backpack.tf/profiles/76561198056121732#!/compare/1492646400/1495584000 - ?

http://backpack.tf/profiles/76561198112709115#!/compare/1493942400/1494028800 - sold with 10 keys for Flaming Lantern Bombing Run (27) = 17 keys (low)

http://backpack.tf/profiles/76561198071167440#!/compare/1491523200/1491609600 - sold for 20 keys (quicksold)

http://backpack.tf/profiles/76561198148213857#!/compare/1493164800/1496188800 - backpack purchase

http://backpack.tf/profiles/76561198125791160#!/compare/1493424000/1493510400 - sold for 24 keys (quicksold)

http://backpack.tf/profiles/76561197995385177#!/compare/1493337600/1493424000 - bulk

http://backpack.tf/profiles/76561198048008254#!/compare/1494720000/1494806400

http://backpack.tf/profiles/76561198029279861#!/compare/1494460800/1495065600 - ?

http://backpack.tf/profiles/76561198085813142#!/compare/1494633600/1494720000 - sold for 18 keys (quicksold)

http://backpack.tf/profiles/76561198048008254#!/compare/1495324800/1495411200 - sold for 11 keys + ?

http://backpack.tf/profiles/76561198204177583#!/compare/1494979200/1495065600 - bulk for keys

http://backpack.tf/profiles/76561198283717657#!/compare/1494720000/1494806400

http://backpack.tf/profiles/76561198204177583#!/compare/1494633600/1494806400 - sold for Smoking Company Man (18) + Orbiting Planets Carouser's Capotain (9) = 27 keys (outlier)

http://backpack.tf/profiles/76561198316071886#!/compare/1494633600/1494720000 - sold for Steaming Helmet Without a Home (11) + Terror-Watt Hetman's Headpiece (14) = 25 keys

http://backpack.tf/profiles/76561198072085386#!/compare/1494115200/1494288000 - bulk

http://backpack.tf/profiles/76561198304138933#!/compare/1494374400/1494460800

http://backpack.tf/profiles/76561197973932877#!/compare/1494201600/1494460800 - sold for 20 keys

http://backpack.tf/profiles/76561198163464045#!/compare/1491523200/1492905600

http://backpack.tf/profiles/76561198176328557#!/compare/1491264000/1491868800 - scm

http://backpack.tf/profiles/76561198045466865#!/compare/1491091200/1491177600 - sold for Circling Peace Sign Ze Goggles (17) + sweets (3) = 20 keys

http://backpack.tf/profiles/76561198060713398#!/compare/1491004800/1491091200 - sold for Strange Australium Minigun + sweets = 16 keys (low)

http://www.tf2outpost.com/trade/28850146

http://backpack.tf/profiles/76561198178256565#!/compare/1490486400/1490659200 - sold for 19 keys (quicksold)

http://backpack.tf/profiles/76561197998560872#!/compare/1493596800/1493856000 - backpack purchase

http://backpack.tf/profiles/76561198047918122#!/compare/1491177600/1492992000 - ?

http://www.tf2outpost.com/trade/28833187

http://backpack.tf/profiles/76561198048825528#!/compare/1492560000/1492646400 - sold for 17 keys + 123 ref + sweets = 22 keys

http://backpack.tf/profiles/76561198071308988#!/compare/1491091200/1491955200

http://backpack.tf/profiles/76561198077372453#!/compare/1491264000/1491436800 - scm

Mini’s:

Purple Confetti Frenchman's Beret:

http://imgur.com/a/CLswO - b/o: 17 keys (20 days)

(found every sale on this but all were bulk/invalid, not shown here since i decided to close the tab and lost all the data :DDDDDDDDDD kill me )

Stormy Storm Airdog :

http://backpack.tf/suggestion/59301b7bc44045406f25b913 = 16 keys

Smoking Company Man:

http://backpack.tf/suggestion/59314f30c4404540f453d5e2 = 18 keys

Orbiting Planets Carouser's Capotain:

Sellers:

https://marketplace.tf/items/259;5;u32

https://backpack.tf/item/1409589057 - b/o: $22.99 = 11 keys

http://www.tf2outpost.com/trade/29190315

http://www.tf2outpost.com/trade/29190266 - b/o: 10 keys (4 months)

Sold:

http://backpack.tf/profiles/76561198098262596#!/compare/1491523200/1491609600 - bulk

taking 9 keys (current price)

Terror-Watt Hetman's Headpiece:

http://backpack.tf/suggestion/59316b91e33877448c30246c = 14 keys

Conclusion:

sales at 16, 17, 18, 18, 18, 19, 19, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 22, 23, 24, 24, 25, 25, 25, 27, 28, 28, 29, 39

taking 20-25 keys