History 1: https://backpack.tf/item/10989667589

Sold to a quickbuyer, ~9 keys match:

https://backpack.tf/profiles/76561199078619892#!/compare/1641600000/1641686400

https://backpack.tf/profiles/76561198841279602#!/compare/1641600000/1641686400

Untrace:

https://backpack.tf/profiles/76561198841279602#!/compare/1643241600/1643328000

https://backpack.tf/profiles/76561198009806550#!/compare/1643155200/1643328000

Most likely ~10 keys https://gladiator.tf/listings/61f1d0436dc45e14c43e8b67

History 2: https://backpack.tf/item/9274097430

Untrace/QSStore dump:

https://backpack.tf/profiles/76561198027460187#!/compare/1639872000/1640217600

https://backpack.tf/profiles/76561199110809353#!/compare/1639785600/1639872000

Untrace:

https://backpack.tf/profiles/76561199110809353#!/compare/1640217600/1640304000

https://backpack.tf/profiles/76561197998237785#!/compare/1632441600/1645747200

Most likely ~10 keys https://gladiator.tf/listings/61c413d5d9933bd47f0294e1

History 3: https://backpack.tf/item/9153292849

10 keys:

https://backpack.tf/profiles/76561198275478002#!/compare/1642723200/1642809600

https://backpack.tf/profiles/76561198820290481#!/compare/1642464000/1642809600

History 4: https://backpack.tf/item/9154350791

Untrace:

https://backpack.tf/profiles/76561198962500536#!/compare/1639267200/1639699200

https://backpack.tf/profiles/76561198041230730#!/compare/1639526400/1640822400

History 5: https://backpack.tf/item/9158112611

9 keys:

https://backpack.tf/profiles/76561198850178158#!/compare/1641427200/1641513600

https://backpack.tf/profiles/76561198280524116#!/compare/1641340800/1641513600

https://marketplace.tf/items/tf2/31114;5;u151

$21.99 / $1.74 = 12.64 keys ~13 keys

History 6: https://backpack.tf/item/9172229699

https://marketplace.tf/items/tf2/31114;5;u151

$21.99 / $1.83 = 12.02 keys ~12 keys

Buyers are at ~10 keys right now but there's lots of lower sales (1 valid sale at 10 keys, 1 at 9 keys, a few potential 10 key sales)

Gonna go with 10-13 keys here