Using last month

Sale 1:

Sold for $17.49 on Marketplace.tf

https://marketplace.tf/items/1108;5;u3010

17.49/1.97 = ~8.88

X = 9

Sale 2:

Quicksold for 6 keys

Seller: https://backpack.tf/profiles/76561198102391003#!/compare/1522972800/1523059200

Buyer: https://backpack.tf/profiles/76561198438525576#!/compare/1522972800/1523059200

X = 6

Sale 3:

Sold for 5 keys?

Seller: https://backpack.tf/profiles/76561198086076383#!/compare/1522972800/1523059200

Buyer: https://backpack.tf/profiles/76561198102391003#!/compare/1522972800/1523059200

I feel like some of the keys were spent on the other taunt, though the seller’s end on that taunt is untraceable, so I can’t tell if there were other keys involved. Excluding this sale.

Sellers:

12 keys:

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

https://backpack.tf/item/3226306473

18 keys:

https://i.imgur.com/8j0a3xL.png

https://backpack.tf/item/2956309305

19 keys:

https://i.imgur.com/NC3EsTf.png

https://backpack.tf/item/4373170814

20 keys:

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

https://backpack.tf/item/3058007057

And a seller on the SCM for ~6 keys worth:

https://i.imgur.com/C4faYq6.png

Sales at:

6

9

6 may have quicksold, but the seller at 6 keys worth on the SCM supports.

Going with 6-9.