History: https://backpack.tf/item/7272824337

Untraceable (none of the keys match in buyer's compare):

https://backpack.tf/profiles/76561198137564765#!/compare/1608163200/1608422400

https://backpack.tf/profiles/76561198314211872#!/compare/1608249600/1608336000

Untraceable (the keys don't match), item also doesn't show in buyer's compare so it was most likely bought then instantly depsoited to Marketplace.tf:

https://backpack.tf/profiles/76561198314211872#!/compare/1608681600/1608768000

https://backpack.tf/profiles/76561198080179568#!/compare/1608768000/1608854400

Sold on Marketplace.tf

Untraceable, nothing matches:

https://backpack.tf/profiles/76561198316441887#!/compare/1613520000/1615420800

https://backpack.tf/profiles/76561198095293350#!/compare/1614038400/1614124800

Marketplace.tf sales: https://marketplace.tf/items/tf2/1116;5;u3022

December 12: $18/1.89=9.52 ~9.5 keys

January 15: $17.99/2.11=8.53 ~8.5 keys

February 17: $17.99/2.11=8.53 ~8.5 keys

Taking 8.5-9.5 keys here