Sale 1:

Sold for 26 keys

Seller: https://backpack.tf/profiles/76561198004517334#!/compare/1511308800/1511395200

Buyer: https://backpack.tf/profiles/76561198132182386#!/compare/1511308800/1511395200

X = 26

Sale 2:

Quicksold for 21 keys

Seller: https://backpack.tf/profiles/76561198394877897#!/compare/1511222400/1511308800

Buyer: https://backpack.tf/profiles/76561198292156436#!/compare/1511222400/1511308800

X = 21

Sale 3:

Bulk for Frostbite Bear

Seller: https://backpack.tf/profiles/76561198072811851#!/compare/1505779200/1505865600

Buyer: https://backpack.tf/profiles/76561198004517334#!/compare/1505692800/1505865600

Sellers:

25 keys:

https://i.imgur.com/7PCQLQF.png - 15 hours, most likely re-listed

https://backpack.tf/item/1285102083 - owned for 4 days

Sales at:

21

26

21 quicksold, excluding 21.

Seller at 25.

Going with 25-26.

Ugh, seller re-listed for 24. Gonna close this and wait until it re-sells, if I remember to check back on this.