History 1: https://backpack.tf/item/9142460213

https://marketplace.tf/items/tf2/31117;5;u56

$34.99 / $1.81 = 19.33 keys ~19 keys

History 2: https://backpack.tf/item/9151540319

4 keys 2 rec matches:

https://backpack.tf/profiles/76561198311498888#!/compare/1644624000/1644710400

https://backpack.tf/profiles/76561198042627167#!/compare/1644624000/1644710400

Dumped to QSStore for ~17 keys:

https://backpack.tf/profiles/76561198042627167#!/compare/1645574400/1645920000

https://backpack.tf/profiles/76561199084784906#!/compare/1645574400/1645660800

17 keys:

https://backpack.tf/profiles/76561199084784906#!/compare/1650153600/1650240000

https://backpack.tf/profiles/76561198355520251#!/compare/1650067200/1650240000

History 3: https://backpack.tf/item/9171616503

first 2 sales are unusuable since one of the people involved is banned for scamming

Bulk for Miami Nights Blighted Beak

https://backpack.tf/profiles/76561198049884052#!/compare/1646784000/1646870400

https://backpack.tf/profiles/76561198057897812#!/compare/1646784000/1646870400

Sold to a bot for ~17 keys:

https://backpack.tf/profiles/76561198057897812#!/compare/1646956800/1647043200

https://backpack.tf/profiles/76561199192605815#!/compare/1646956800/1647043200

Likely bought then instantly dumped to qsstore:

https://backpack.tf/profiles/76561199192605815#!/compare/1647734400/1647820800

https://backpack.tf/profiles/76561198850121720#!/compare/1647734400/1647820800

Sold for a Wandering Wisps California Cap + ~1 key of ref:

https://backpack.tf/profiles/76561198850121720#!/compare/1649808000/1649894400

https://backpack.tf/profiles/76561198081593945#!/compare/1649462400/1650067200

the cap is gonna be ~17 keys https://gladiator.tf/sales?item=Wandering%20Wisps%20California%20Cap&at=2022-04-19T14:55:08.058Z

17+1=18

History 4: https://backpack.tf/item/9213124907

Bought then instantly listed on Marketplace.tf at $34.99 however nothing useful appears in the compare:

https://backpack.tf/profiles/76561198140953055#!/compare/1644019200/1644105600

Sales at 17, 17, 17, 18, 19

Buyers are at ~17 but 17 is a really common trading point so including it

Taking 17-19 keys