Sale 1:

Sold for 23 keys + FN Dragon Slayer War Paint (~2)

Seller: https://backpack.tf/profiles/76561198125791160#!/compare/1511740800/1511827200

Buyer: https://backpack.tf/profiles/76561198131498703#!/compare/1511654400/1512086400

X = 25

Sale 2:

Sold for $43 on marketplace.tf

No outpost

https://marketplace.tf/items/617;5;u30

https://backpack.tf/item/641495853

43/1.9 = ~22.6

X = 23

Sale 3:

Sold for 23 keys

Seller: https://backpack.tf/profiles/76561198161053005#!/compare/1515628800/1515715200

Buyer: https://backpack.tf/profiles/76561198175002442#!/compare/1515628800/1515715200

https://imgur.com/a/Tj7gQ - Credit to Jap Doggo

X = 23

Sale 4:

Sold for 22 keys (ID’s match)

Seller: https://backpack.tf/profiles/76561198095022965#!/compare/1514073600/1514246400

Buyer: https://backpack.tf/profiles/76561198013211815#!/compare/1514160000/1515110400

X = 22

Sale 5:

Sold for ~21 keys in pure/items

http://www.tf2outpost.com/trade/29482366 - B/O of 22

Seller: https://backpack.tf/profiles/76561198165477682#!/compare/1514851200/1514937600

Buyer: https://backpack.tf/profiles/76561198161053005#!/compare/1514764800/1514937600

X = 21

Sale 6:

Sold for 21 keys

Seller: https://backpack.tf/profiles/76561198338575476#!/compare/1511481600/1511568000

Buyer: https://backpack.tf/profiles/76561198310897229#!/compare/1511481600/1511568000

X = 21

Sale 7:

Sold for 20 keys

Seller: https://backpack.tf/profiles/76561198072240925#!/compare/1512864000/1512950400

Buyer: https://backpack.tf/profiles/76561198152219414#!/compare/1512864000/1512950400

X = 20

Sale 8:

Sold for 20 keys

Seller: https://backpack.tf/profiles/76561198002757046#!/compare/1516492800/1516579200

Buyer: https://backpack.tf/profiles/76561198455759447#!/compare/1516492800/1516579200

X = 20

Sale 9:

Sold with 5 keys for Purple Energy Buckaroo’s Hat

Seller: https://backpack.tf/profiles/76561198152219414#!/compare/1513468800/1513555200

Buyer: https://backpack.tf/profiles/76561198165477682#!/compare/1513468800/1513555200

Can be used on the Buckaroo’s Hat.

Sale 10:

Bulk for Morning Glory Officer’s Ushanka

Seller: https://backpack.tf/profiles/76561198175002442#!/compare/1516924800/1517097600

Buyer: https://backpack.tf/profiles/76561198090540779#!/compare/1517097600/1517356800

Sellers:

https://i.imgur.com/1oVzZbe.png

22 keys:

https://backpack.tf/item/984194074

25 keys:

https://backpack.tf/item/1850240484

30 keys:

https://backpack.tf/item/1279971700

Sales at:

20 (2x)

21 (2x)

22

23 (2x)

25

Going with 20-25.