Requested by Mindacos

Last suggestion was based off of unsolds, so this change should be fine.

Sale 1:

Sold for $29.99 on Marketplace.tf

https://marketplace.tf/items/1119;5;u3005

https://backpack.tf/item/3403427935

29.99/1.96 = ~15.3

X = 15

Sale 2:

Sold for 11 keys

Seller: https://backpack.tf/profiles/76561198080179568#!/compare/1512086400/1512172800

Buyer: https://backpack.tf/profiles/76561198061832806#!/compare/1512000000/1512259200

X = 11

Sale 3:

Sold for 11 keys to a quickbuyer

Seller: https://backpack.tf/profiles/76561198109741092#!/compare/1511740800/1511827200

Buyer: https://backpack.tf/profiles/76561198205939253#!/compare/1511740800/1511827200

X = 11

Sale 4:

Sold for 11 keys to a quickbuyer

Seller: https://backpack.tf/profiles/76561198080179568#!/compare/1512000000/1512086400

Buyer: https://backpack.tf/profiles/76561198055847835#!/compare/1512000000/1512086400

X = 11

Sellers:

12 keys:

https://i.imgur.com/tfkDjKp.png - young

13 keys:

https://i.imgur.com/XWXaKvD.png - 8 days

https://i.imgur.com/ws78prs.png - 1 day

14 keys:

https://i.imgur.com/t5dQCOD.png - 10 days

Sales at:

11 (3x)

15

11 went to quickbuyers, mostly, but these sales are too common to be excluded, and the sellers support this.

Going with 11-15.