Sellers:

http://www.tf2outpost.com/trade/29206778 - b/o: 17 keys (1 day)

Sold:

http://backpack.tf/profiles/76561198087812363#!/compare/1495411200/1495497600 - ?

http://backpack.tf/profiles/76561198121782036#!/compare/1491177600/1491264000 - bulk

http://www.tf2outpost.com/trade/28860509

http://backpack.tf/profiles/76561198126114757#!/compare/1491609600/1491782400 - sold for 16 keys + metal = 17 keys

http://www.tf2outpost.com/trade/28858023

http://backpack.tf/profiles/76561198057858014#!/compare/1491264000/1491350400

http://backpack.tf/profiles/76561198126114757#!/compare/1491091200/1491350400 - sold for Searing Plasma Professional's Panama (21) = 20 keys b/o

http://backpack.tf/profiles/76561198057858014#!/compare/1490745600/1490832000 - ?

http://www.tf2outpost.com/trade/28849141

http://backpack.tf/profiles/76561198146220878#!/compare/1490745600/1490832000 - sold for Kill-a-Watt Airdog (14) = 14 keys (low)

http://backpack.tf/profiles/76561198318692539#!/compare/1490400000/1490486400 - sold for 17 keys

http://backpack.tf/profiles/76561198202369941#!/compare/1490400000/1490486400 - sold for Strange Professional Killstreak Australium Ambassador (15) = 15 keys

http://www.tf2outpost.com/trade/28819168

http://backpack.tf/profiles/76561197987128070#!/compare/1490140800/1490227200 - sold for 15 keys

http://backpack.tf/profiles/76561198091727682#!/compare/1493596800/1493683200 - sold for Midnight Whirlwind Taunt: Deep Fried Desire (15) = 15 keys

http://backpack.tf/profiles/76561198115471878#!/compare/1493510400/1493596800 - sold with 2 keys for 72 Taunt: I See You (19) = 17 keys

http://backpack.tf/profiles/76561198047208911#!/compare/1493337600/1493424000 - sold with sweets (3) for Bubbling Tyrantium Helmet (15) + Steaming Conquistador (13) = 25 keys (outlier)

http://backpack.tf/profiles/76561198141456468#!/compare/1491868800/1492128000 - sold with 1 key for Haunted Ghosts Physician's Protector = high

Conclusion:

sales at 14, 15, 15, 15, 17, 17, 17, 20, 25

taking 15-20 keys