Sales 1 & 2:

Sold for $50 and $25 on marketplace.tf

https://marketplace.tf/items/463;5;u3004

$50 is gonna be an outlier, excluding that one.

25/1.95 = ~12.8

X = 13

Sale 3:

Sold for Stormy Trucker’s Topper (17)

http://www.tf2outpost.com/trade/29668351 - B/O of 13

Seller: https://backpack.tf/profiles/76561198164036774#!/compare/1527724800/1527811200

Buyer: https://backpack.tf/profiles/76561198114527904#!/compare/1527724800/1527811200

X = 13 (Capped by B/O)

Sale 4:

Sold for 12 keys

Seller: https://backpack.tf/profiles/76561198002757046#!/compare/1527465600/1527552000

Buyer: https://backpack.tf/profiles/76561198164036774#!/compare/1527465600/1527552000

Seller’s end shows 69 keys with matching ID’s, but only the last 12 keys were involved, most likely due to the seller accepting two trades in rapid succession.

X = 12

Sellers:

20 keys:

https://i.imgur.com/5n53YN2.png

https://backpack.tf/item/3484090076

https://backpack.tf/item/6851284773

Sales at:

12

13 (2x)

Going with 12-13.