History 1: https://backpack.tf/item/8156882116

10 keys pure:

https://backpack.tf/profiles/76561198160856661#!/compare/1597968000/1598054400

https://backpack.tf/profiles/76561198334765018#!/compare/1597968000/1598054400

History 2: https://backpack.tf/item/7362696709

Untraceable sale:

https://backpack.tf/profiles/76561197998376896#!/compare/1601769600/1601856000

https://backpack.tf/profiles/76561198063162455#!/compare/1601337600/1601856000

Two Marketplace.tf sales in August: https://marketplace.tf/items/tf2/1183;5;u3024

https://backpack.tf/item/6721841531

https://backpack.tf/item/6257089029

None of them have precise dates so we can't trace which history is which sale

August 11:$17.11/1.84=9.3 keys ~9.5

August 16: $17.11/1.79=9.56 keys ~9.5

Other marketplace.tf sales untraceable via item histories

September 30: $17.45/1.83=9.54 keys ~9.5

October 13 2020: $16/1.1.89=8.47 keys ~8.5

(Note: none of the mp sales had buyouts)

All fit in-range of current sellers/buyers and none need to be excluded.

Going 8.5-10