Never priced.

Sale 1:

https://backpack.tf/item/5459428954

https://backpack.tf/profiles/76561198150774204#!/compare/1603065600/1603756800

https://backpack.tf/profiles/76561198081925059#!/compare/1603065600/1603756800

9 keys maybe. History IDs don't line up.

Sale 2:

https://backpack.tf/item/5459428954

https://backpack.tf/profiles/76561198357428287#!/compare/1604448000/1604534400

https://backpack.tf/profiles/76561198081925059#!/compare/1604534400/1604448000

Bulk??

Sales 3 & 4:

https://backpack.tf/item/4457095203

Excluding this history as the items looked to have been scammed. Trade banned user buys and sells.

Sale 5:

https://backpack.tf/item/3599225652

https://backpack.tf/profiles/76561199032764875#!/compare/1604361600/1606176000

https://backpack.tf/profiles/76561198129822860#!/compare/1606780800/1610582400

Multiple items are transferred from both parties. Bulk? Excluding.

Sale 6:

https://backpack.tf/item/3599225652

https://marketplace.tf/items/tf2/30609;5;u3036

November 21, 2020: $60

$60 / $1.75 = 34.29 keys (https://manic.tf/keyprice/?at=2020-11-21)

Conclusion:

Going with the only traceable sale. If the mods think 9 keys is better, I can resuggest.