Using last month.

Sale 1:

Sold for 15 keys

Seller: https://backpack.tf/profiles/76561198335791307#!/compare/1532296800/1532383200

Buyer: https://backpack.tf/profiles/76561198081153707#!/compare/1532217600/1532390400

https://backpack.tf/item/3415126435 - “Maybe gifted to his friend or something.” – Woifi, 2k18

Bot.tf confirms: https://i.imgur.com/zmF5Uey.png

X = 15

Sale 2:

Sold for 14 keys (ID’s match)

Seller: https://backpack.tf/profiles/76561197994034714#!/compare/1531180800/1531267200

Buyer: https://backpack.tf/profiles/76561198060280493#!/compare/1530662400/1531267200

X = 14

Sale 3:

Sold for ~2 keys in pure + ~9 keys in items

Seller: https://backpack.tf/profiles/76561198348625599#!/compare/1532131200/1532217600

Buyer: https://backpack.tf/profiles/76561198216527509#!/compare/1532131200/1532217600

X = 11

Sale 4:

Sold for $21 on marketplace.tf

https://marketplace.tf/items/1115;5;u3004

21/1.98 = ~10.6

X = 11

Sale 5:

Sold for 11 keys?

Seller: https://backpack.tf/profiles/76561198312583107#!/compare/1531094400/1531180800

Buyer: https://backpack.tf/profiles/76561198126944641#!/compare/1530835200/1531267200

Untraceable. Bot.tf confirms, but it is unreliable.

https://i.imgur.com/zmF5Uey.png

X = 11?

Sale 6:

Sold to a bot for 7 keys + 14 ref?

Seller: https://backpack.tf/profiles/76561198095212046#!/compare/1531699200/1531785600

Buyer: https://backpack.tf/profiles/76561198335791307#!/compare/1531699200/1531785600

Untraceable. Only refined metal matched. However, as all the ref is traceable, I don’t doubt that the sale was full pure so I’ll count it.

https://i.imgur.com/zmF5Uey.png

X = 7.5

Sale 7:

Bulk for pure?

Seller: https://backpack.tf/profiles/76561198362185176#!/compare/1531440000/1531526400

Buyer: https://backpack.tf/profiles/76561198144945119#!/compare/1531440000/1531526400

Sellers:

Offers:

http://www.tf2outpost.com/trade/29491922

And 2 sellers on marketplace for as low as ~20 keys worth.

Sales at:

7.5

11 (2x)

14

15

And an untraceable sale at 11.

7.5 looks like an outlier, excluding.

Going with 11-15.