Resuggest from https://backpack.tf/suggestion/5fb2d26379808e09a1011848 (thx Xergoyf)

History 1: https://backpack.tf/item/8343960708

Used as bulk for the Vexed Volcanics Vampire Vanquisher

https://backpack.tf/profiles/76561198147121950#!/compare/1602201600/1602288000

https://backpack.tf/profiles/76561198070466521#!/compare/1579478400/1602288000

Sold on Marketplace.tf (see below)

Dumped to Quicksell.store

https://backpack.tf/profiles/76561198435061144#!/compare/1606348800/1606435200

https://backpack.tf/profiles/76561198850121720#!/compare/1606348800/1606435200

History 2: https://backpack.tf/item/8364816814

Used as bulk for the Australium Force-A-Nature

https://backpack.tf/profiles/76561198972485408#!/compare/1603843200/1604966400

https://backpack.tf/profiles/76561198341717773#!/compare/1604620800/1604707200

Sold for 10 keys pure:

https://backpack.tf/profiles/76561198341717773#!/compare/1604966400/1605052800

https://backpack.tf/profiles/76561199016422496#!/compare/1605052800/1605139200

Marketplace.tf sales: https://marketplace.tf/items/tf2/1112;5;u3034

(UNTRACEABLE) November 15: $4/1.76=2.27 keys (We all know this is a quicksell, come on)

(UNTRACEABLE) November 19: $14.99/1.74=8.61 ~8.5 keys

(HISTORY 1) November 21: $20/1.1.76=11.36 ~11 keys

The buyer at 11 dumped it not long after buying so excluding that sale

Going 8.5-10