History 1: https://backpack.tf/item/9331461152

Untraceable:

https://backpack.tf/profiles/76561198104090803#!/compare/1604448000/1604620800

https://backpack.tf/profiles/76561198023051867#!/compare/1604361600/1604620800

Other sales are tradebacks.

History 2: https://backpack.tf/item/9331461142

Before it was unusualified

https://backpack.tf/profiles/76561198298504614#!/compare/1603584000/1603756800

https://backpack.tf/profiles/76561198873140319#!/compare/1603670400/1603756800

Before it was unusualified:

https://backpack.tf/profiles/76561198873140319#!/compare/1604016000/1604102400

Untraceable:

https://backpack.tf/profiles/76561198449851956#!/compare/1604880000/1604966400

https://backpack.tf/profiles/76561198367641146#!/compare/1604188800/1604966400

Untraceable, none of the pure matches on seller's side, only one key matches on buyer's side

https://backpack.tf/profiles/76561198367641146#!/compare/1608163200/1608249600

https://backpack.tf/profiles/76561198147734542#!/compare/1608163200/1608508800

History 3: https://backpack.tf/item/8734653893

Before it was unusualified:

https://backpack.tf/profiles/76561198116848524#!/compare/1603929600/1604016000

Before it was unusualified:

https://backpack.tf/profiles/76561198829669573#!/compare/1603929600/1604016000

History 4: https://backpack.tf/item/6311526310

Untraceable:

https://backpack.tf/profiles/76561198159828753#!/compare/1604188800/1604275200

https://backpack.tf/profiles/76561198355742840#!/compare/1603324800/1604534400

History 5: https://backpack.tf/item/6255053220

first 3 sales are tradebacks

Bulk:

https://backpack.tf/profiles/76561198023051867#!/compare/1610064000/1610150400

https://backpack.tf/profiles/76561199099031605#!/compare/1609718400/1609977600

History 6: https://backpack.tf/item/6253733360

Untraceable

https://backpack.tf/profiles/76561198085830649#!/compare/1604534400/1605052800

https://backpack.tf/profiles/76561197963500354#!/compare/1604966400/1605052800

Untraceable

https://backpack.tf/profiles/76561197963500354#!/compare/1605052800/1605139200

https://backpack.tf/profiles/76561198110579536#!/compare/1605139200/1605225600

Looks like sold on SCM, so many sales happen on there we will never find out which one it is...

https://backpack.tf/profiles/76561198110579536#!/compare/1606003200/1608681600

https://backpack.tf/profiles/76561198056681334#!/compare/1606089600/1606176000

Marketplace.tf sales: https://marketplace.tf/items/tf2/30876;5;u3045

November 3: $6.5/1.82=3.57 keys ~3.55

November 11: $6.5/1.8=3.61 keys ~3.6

November 15: $10/1.78=5.62 keys ~5.6

December 17: $9.5/2.01=4.73 keys ~~4.75

Median value of the sales is under 5 keys (~4.6 keys) so rounding to the nearest 0.05 keys

Taking a range of 3.55-5.6 keys