Almost forgot about this

Sale 1:

Sold for $22 and $15 on marketplace.tf

https://marketplace.tf/items/51;5;u33

https://backpack.tf/item/813280735

15 would’ve gone to a buy order, excluding.

22/1.97 = ~11.2

X = 11

Sale 2:

Sold for 10 keys + 25 ref

Seller: https://backpack.tf/profiles/76561198304138933#!/compare/1525046400/1525132800

https://backpack.tf/profiles/76561198178611637 - buyer’s backpack wasn’t scanned at the time of the purchase.

X = 11

Sale 3:

Sold for 10 keys + 5 ref

Seller: https://backpack.tf/profiles/76561198341086501#!/compare/1523318400/1523404800

Buyer: https://backpack.tf/profiles/76561198258121359#!/compare/1523232000/1523404800

X = 10

Sale 4:

Sold to a bot for 9 keys + 16 ref

Seller: https://backpack.tf/profiles/76561198160399557#!/compare/1523750400/1523923200

Buyer: https://backpack.tf/profiles/76561198304138933#!/compare/1523664000/1523750400

Bot.tf confirms: https://i.imgur.com/3mweT7d.png

X = 10

Sale 5:

Sold for 6 keys + ~1 key in items?

Seller: https://backpack.tf/profiles/76561198217456515#!/compare/1522713600/1522800000

Buyer: https://backpack.tf/profiles/76561198050433855#!/compare/1522713600/1522800000

Other items from the buyer’s end may have been involved, but I can’t confirm this.

Sellers:

~10.4 keys:

https://i.imgur.com/dy3qLu8.png

https://backpack.tf/item/532926591

Sales at:

10 (2x)

11 (2x)

Going with 10-11.