Item 1

https://backpack.tf/item/8943551734

Sale 1

https://backpack.tf/profiles/76561198148408882#!/compare/1672876800/1671580800

https://backpack.tf/profiles/76561198311498888#!/compare/1672876800/1672790400

Untrace

Sale 2

https://backpack.tf/profiles/76561198311498888#!/compare/1675641600/1675728000

https://backpack.tf/profiles/76561198230109280#!/compare/1675555200/1675728000

Can't tell

Item 2

https://backpack.tf/item/7956786336

Sale 2

https://marketplace.tf/items/tf2/184;5;u58

Feb-20?

https://manic.tf/keyprice/?site=marketplace.tf&at=2023-02-20&price=55.95

~27 keys

Sale 3

https://gladiator.tf/time-machine?item=Cloud%209%20Gentleman%27s%20Gatsby&at=2023-02-25T01:08:15.000Z

https://backpack.tf/profiles/76561198082401774#!/compare/1677283200/1677542400

https://backpack.tf/profiles/76561199111658162#!/compare/1677196800/1677283200

Probably ~19 keys

Item 3

https://backpack.tf/item/7956015998

Sale 4

https://backpack.tf/profiles/76561198848879603#!/compare/1671667200/1675036800

https://backpack.tf/profiles/76561198004438787#!/compare/1660780800/1674345600

Can't tell

Item 4

https://backpack.tf/item/1781381486

Sale 5

https://backpack.tf/profiles/76561198065206206#!/compare/1670889600/1671321600

https://backpack.tf/profiles/76561198096022249#!/compare/1671235200/1671321600

Nothing matches

Sale 6

https://gladiator.tf/time-machine?item=Cloud%209%20Gentleman%27s%20Gatsby&at=2022-12-20T03:55:14.000Z

https://backpack.tf/profiles/76561198096022249#!/compare/1671494400/1671580800

https://backpack.tf/profiles/76561198082401774#!/compare/1671494400/1671580800

40 keys?

Ignoring the tradeback....

Sale 7

https://marketplace.tf/items/tf2/184;5;u58

Mar 1?

https://manic.tf/keyprice/?site=marketplace.tf&at=2023-03-01&price=55.95

~27 keys

Mp.tf

https://marketplace.tf/items/tf2/184;5;u58

https://manic.tf/keyprice/?site=marketplace.tf&at=2023-01-22&price=55.99

~28 keys

Mannco.store

https://mannco.store/item/440-cloud-9-unusual-gentlemans-gatsby

https://manic.tf/keyprice/?site=mannco.store&at=2023-02-07&price=55.8

~30 keys

Total Sales

19, 27, 27, 28, 30, 40

Given the amt of sales above the unsold, and it's relatively new listing

Taking 25 - 30 keys, and using the unsold as the low end?