Sale 1:

Sold for 12 keys

https://backpack.tf/profiles/76561199111073161#!/compare/1773792000/1773878400 - Near ID: 16828125032

https://backpack.tf/profiles/76561199087135121#!/compare/1773619200/1773878400

https://backpack.tf/item/12126529065

= 12 keys

Sale 2:

Sold for 10 keys + negligible metal

https://backpack.tf/profiles/76561199581722058#!/compare/1771027200/1771113600 - Near ID: 16728714227

https://backpack.tf/profiles/76561198127570121#!/compare/1769817600/1773532800

https://backpack.tf/item/12250925227

= 10 keys

Other Sales:

#1

https://backpack.tf/profiles/76561199873157340#!/compare/1767657600/1767744000

https://backpack.tf/profiles/76561199537522990#!/compare/1767657600/1767744000

https://backpack.tf/item/12179220785

Probably scammed

#2

https://backpack.tf/profiles/76561199050131741#!/compare/1770076800/1770854400

https://backpack.tf/profiles/76561199847285011#!/compare/1770854400/1771372800

https://backpack.tf/item/12250925227

Most likely scammed. Next histories up to STN seem to be the same boat.

https://backpack.tf/item/9557400178 - qsstore bots

https://backpack.tf/item/12209475111 - qsstore bots

Sellers:

https://i.imgur.com/JD79YED.png

https://backpack.tf/item/9557400178 - ~12.5 keys

https://backpack.tf/item/6484337853 - 15 keys

https://backpack.tf/item/12126529065 - 15 keys

https://backpack.tf/item/12255015895 - 20 keys

https://marketplace.tf/items/tf2/30842;5;u3097

https://backpack.tf/item/6268931334 - $29.99

https://backpack.tf/item/12264008996 - $29.99

https://backpack.tf/item/11098564943 - $38.99

Sales at:

10

12

Taking 10-12 keys.