Sale 1:

Sold for 9 keys

Seller: https://backpack.tf/profiles/76561198158995082#!/compare/1526688000/1526774400

Buyer: https://backpack.tf/profiles/76561198124728984#!/compare/1526688000/1526774400

X = 9

Sale 2:

Sold for 7 keys + 26 ref

Seller: https://backpack.tf/profiles/76561198305676157#!/compare/1525910400/1525996800

Buyer: https://backpack.tf/profiles/76561198337011605#!/compare/1525651200/1525996800

Bot.tf confirms: https://i.imgur.com/GdkxGRa.png

NearID shows 14 keys, several don’t match, the rest come from Zol. Buyer’s end shows a stormy sola topi going to zol, so the sola topi would’ve gone to zol for keys, and the keys gone towards the Burstchester. Buyer’s end also shows some ref coming from the bot, so it most likely would’ve sold with the ref for 8 keys.

X = 8

Sale 3:

Sold for gross spelled stuff

Seller: https://backpack.tf/profiles/76561198197109587#!/compare/1526774400/1526860800

Buyer: https://backpack.tf/profiles/76561197991111981#!/compare/1526774400/1526860800

Sale 4:

Bulk for Darkblaze Texas Tin Gallon

Seller: https://backpack.tf/profiles/76561198092964413#!/compare/1525737600/1525910400

Buyer: https://backpack.tf/profiles/76561198305676157#!/compare/1525824000/1525910400

Sellers:

19 keys:

https://i.imgur.com/Iaxq2bv.png

https://backpack.tf/item/5326504622

https://backpack.tf/item/6557810944

https://backpack.tf/item/4387160459

Sales at:

8

9

Going with 8-9.