Using Avg week key price

https://marketplace.tf/items/tf2/30548;5;u36

$21.99 / $1.78 = 12.35 keys

no history or B/O found

other active history: Ignoring as it is essentially bounced between bots

https://backpack.tf/item/8818257569

(thanks shuffle for info)

Sold for 12 Keys + 22 Refined

https://backpack.tf/profiles/76561198337734785#!/compare/1604102400/1604188800

The buyer promptly sold it to a buy order the next day, so this sale can be excluded (though it supports including 12)

Think this sold for 11 Keys (one goes to a different quicksell.store bot)

https://backpack.tf/profiles/76561198379116660#!/compare/1608854400/1609200000

https://imgur.com/a/W1lKFHc - Seller at 11 Keys

https://mannco.store/item/24535

https://backpack.tf/item/8818257569

11 to 12 will work.