Sale 1:

Sold for 45 keys + ~1 key in items

http://www.tf2outpost.com/trade/28820777 - No B/O

Seller: http://backpack.tf/profiles/76561198031561339#!/compare/1490745600/1490832000

Buyer: http://backpack.tf/profiles/76561197983558864#!/compare/1490745600/1490832000

X = 46

Sale 2:

Sold for Orbiting Fire Thirst Blood (20) + Infernal Smoke Fresh Brewed Victory (26.5)

No outpost

Seller: http://backpack.tf/profiles/76561198120382814#!/compare/1492300800/1492387200

Buyer: http://backpack.tf/profiles/76561198287744297#!/compare/1492300800/1492387200

Taunt has sellers at 26. Rounding down here due to those sellers.

X = 46

Sale 3:

Sold for Stormy 13th Dead Cone (Mini at 40 below) + 6 keys (Buyer’s compare link)

No outpost

Seller: http://backpack.tf/profiles/76561198287744297#!/compare/1492300800/1492387200

Buyer: http://backpack.tf/profiles/76561198153735609#!/compare/1492387200/1492473600

X = 46

Sale 4:

Sold for 33 keys + 7 ref

No outpost

Seller: http://backpack.tf/profiles/76561198034312547#!/compare/1489795200/1489968000

Buyer: http://backpack.tf/profiles/76561198160615510#!/compare/1489881600/1489968000

X = 33

Sale 5:

Quicksold for 28 keys

No outpost

Seller: http://backpack.tf/profiles/76561198258937500#!/compare/1493078400/1493164800

Buyer: http://backpack.tf/profiles/76561198277195550#!/compare/1493164800/1493251200

X = 28

Sale 6:

Sold for Circling Heart Birdcage (27)

No outpost

Seller: http://backpack.tf/profiles/76561198153735609#!/compare/1493164800/1493251200

Buyer: http://backpack.tf/profiles/76561198258937500#!/compare/1493078400/1493164800

X = 27

Sale 7:

Sold for Pro. KS Aussie Flamethrower (23)

No outpost

Seller: http://backpack.tf/profiles/76561198160615510#!/compare/1491696000/1491782400

Buyer: http://backpack.tf/profiles/76561198120382814#!/compare/1491696000/1491782400

X = 23

Sale 8:

Sold for Cool Field-Tested Flower Power Shotgun

Seller: http://backpack.tf/profiles/76561198125791160#!/compare/1490486400/1490572800

Buyer: http://backpack.tf/profiles/76561198074375271#!/compare/1490486400/1490572800

Should be used on the Flower Power.

Sale 9:

Bulk for Poisoned Shadows Antlers

Seller: http://backpack.tf/profiles/76561197983558864#!/compare/1492300800/1492473600

Buyer: http://backpack.tf/profiles/76561198070474543#!/compare/1492300800/1492387200

Sale 10:

Bulk for Purple Confetti Blighted Beak

Seller: http://backpack.tf/profiles/76561198260486392#!/compare/1489795200/1490572800

Buyer: http://backpack.tf/profiles/76561198021272428#!/compare/1490400000/1490572800

Sale 11:

Sold with several keys for Smoking Ninja Hood

Seller: http://backpack.tf/profiles/76561198093765664#!/compare/1489276800/1489363200

Buyer: http://backpack.tf/profiles/76561198049072204#!/compare/1489276800/1489363200

Should be used on the Ninja Hood

Stormy 13th Dead Cone Mini:

http://backpack.tf/suggestion/5909e700c4404540635352f5

Sellers:

44 keys:

http://i.imgur.com/f42OaQx.png

http://www.tf2outpost.com/trade/28899628 - 4 days

http://backpack.tf/u/76561198068450551

47 keys:

http://i.imgur.com/HKvG4aA.png - 15 days

http://www.tf2outpost.com/trade/28898642

http://backpack.tf/u/76561198011321852

http://i.imgur.com/YOiqCzD.png - 1 month

http://backpack.tf/u/76561198021272428

http://www.tf2outpost.com/trade/28854921

Sales at:

23

27

28

33

46 (3x)

http://i.imgur.com/YCwyqQD.png - Buyer for 31

http://backpack.tf/u/76561197999873164

Excluding any sales below 31

Sale at 33 looks like an outlier. Excluding 33.

Seller at 44

Going with 44-46.