Sale 1, Aug 2, 2021

Sold on MP https://marketplace.tf/items/tf2/253;5;u29 for 20.99, $20.99 / $1.81 = 11.60 keys, taking 12

Sale 2, Sep 5 2021

Sold on MP https://marketplace.tf/items/tf2/253;5;u29 for 20.29, $20.29 / $1.81 = 11.21 keys, taking 11

Sale 3, Aug 31, 2021

https://backpack.tf/profiles/76561198134641756#!/compare/1630368000/1630886400

https://backpack.tf/profiles/76561198337734785#!/compare/1630281600/1630368000

Seems to have been sold for 8 keys, this is a duped price

Other recent sales involve a bot to bot trade and a dump

Due to dupes not interfering too much with the pricing, I'm taking 8-12