=== History 1 https://backpack.tf/item/6274490314===

sold for unpriced abyssal aura field practice

https://backpack.tf/profiles/76561198068576622#!/compare/1614988800/1615075200

=== History 2 === https://backpack.tf/item/6360055649

Sale @ 81 keys 25 ref:

https://backpack.tf/profiles/76561199126509818#!/compare/1615680000/1615766400

https://backpack.tf/profiles/76561198161272026#!/compare/1615680000/1615766400

sale 2 @ ~80.8 keys on scrap auction: https://scrap.tf/auctions/P9AB2T

=== History 3 https://backpack.tf/item/7190020231 ===

untraceable:

https://backpack.tf/profiles/76561198108359693#!/compare/1614643200/1614729600

https://backpack.tf/profiles/76561198453530349#!/compare/1614643200/1614729600

Bulk sale: https://backpack.tf/profiles/76561198060856516#!/compare/1609804800/1609891200

=== History 4 === https://backpack.tf/item/7899739620

Jan 21st sale on MP: https://marketplace.tf/items/tf2/30862;5;u13

$189.99/2.10=90.47 ~90 keys

=== History 5 === https://backpack.tf/item/8906086373

untraceable:

https://backpack.tf/profiles/76561198034203528#!/compare/1608336000/1610064000

https://backpack.tf/profiles/76561198066829306#!/compare/1605225600/1612742400

Rounding the 2 sales to ~81 keys pure, and the MP sale to ~90 keys --> range of 80-90

PS: big thanks to aj and Strange for helping me out with pricing!