History 1: https://backpack.tf/item/3628277193

11 keys + 5 ref, =11 keys:

https://backpack.tf/profiles/76561197963500354#!/compare/1641945600/1642032000

https://backpack.tf/profiles/76561198132285563#!/compare/1641945600/1642032000

History 2: https://backpack.tf/item/6478982093

SCM:

https://backpack.tf/profiles/76561198965614153#!/compare/1641168000/1643846400

https://backpack.tf/profiles/76561198167612561#!/compare/1642204800/1642291200

sales at different values happened around the time, can't tell which one it is https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20The%20Killer%20Solo

History 3: https://backpack.tf/item/7457366707

15 keys:

https://backpack.tf/profiles/76561199106217370#!/compare/1642032000/1642204800

https://backpack.tf/profiles/76561199101176394#!/compare/1642204800/1642291200

History 4: https://backpack.tf/item/7990707779

Bulk for Strange Searing Plasma Villain's Veil:

https://backpack.tf/profiles/76561198166302924#!/compare/1638921600/1639094400

https://backpack.tf/profiles/76561198345436872#!/compare/1639008000/1639094400

12 keys:

https://backpack.tf/profiles/76561198345436872#!/compare/1640217600/1640304000

https://backpack.tf/profiles/76561198275478002#!/compare/1640131200/1640217600

buyer listed at $44.99 on mptf

History 5: https://backpack.tf/item/9609282036

Looks like it was dumped to a bot:

https://backpack.tf/profiles/76561198038816671#!/compare/1637539200/1637625600

https://backpack.tf/profiles/76561199202787976#!/compare/1637539200/1637625600

Untrace:

https://backpack.tf/profiles/76561199202787976#!/compare/1637625600/1637712000

https://backpack.tf/profiles/76561198060059269#!/compare/1637539200/1637798400

~~

https://marketplace.tf/items/tf2/30609;5;u3070

$39.99 / $1.82 = 21.97 keys ~22 keys

Sales at 11, 12, 15, 22.

11-22 is definitely too wide. 22 is an outlier here since it's far apart from all the other sales and was MP too.

Taking 11-15 keys