Update!

Sale 1: https://backpack.tf/profiles/76561198850274253#!/compare/1589846400/1589932800

https://backpack.tf/profiles/76561198151177000#!/compare/1588723200/1589932800

?

Sale 2: https://backpack.tf/profiles/76561198021055079#!/compare/1592611200/1592697600

https://backpack.tf/profiles/76561198323521382#!/compare/1592265600/1592784000

https://i.imgur.com/aKWeGkE.png - credits to Jarool!

28 pure.

Sale 3: https://backpack.tf/profiles/76561198122307296#!/compare/1590105600/1590278400

https://backpack.tf/profiles/76561197994697258#!/compare/1590192000/1590278400

Use there.

Sale 4: https://backpack.tf/profiles/76561198104026068#!/compare/1589846400/1589932800

https://backpack.tf/profiles/76561198158482500#!/compare/1589846400/1589932800

Sold with 7 keys + some ref for a Isotope Specialized Killstreak Aqua Marine Rocket Launcher (Well-Worn) (33.5 keys)

33.5 - ~7.3 = ~26

Sale 5: https://backpack.tf/profiles/76561198158482500#!/compare/1589846400/1589932800

https://backpack.tf/profiles/76561198962439228#!/compare/1589846400/1589932800

Appears to be 23 pure.

Sale 6: https://backpack.tf/profiles/76561198962439228#!/compare/1591228800/1591315200

https://backpack.tf/profiles/76561198279184953#!/compare/1590796800/1591315200

25 pure.

Sale 7: https://backpack.tf/profiles/76561198414486955#!/compare/1590796800/1594425600

https://backpack.tf/profiles/76561198295044680#!/compare/1590796800/1590883200

?

Sale 8: https://backpack.tf/profiles/76561198295044680#!/compare/1593129600/1593561600

https://backpack.tf/profiles/76561198328282971#!/compare/1593216000/1593388800

7 pure + ~16 in Pro Ks Fabricators.

16 + 7 = 23

Sale 9: https://backpack.tf/profiles/76561198795676044#!/compare/1591488000/1592352000

https://backpack.tf/profiles/76561198176593866#!/compare/1591401600/1591488000

Qs for 19.

Sale 10: https://backpack.tf/profiles/76561198176593866#!/compare/1594512000/1594598400

https://backpack.tf/profiles/76561198389132266#!/compare/1594512000/1594684800

18 pure.

Sale 11: https://backpack.tf/profiles/76561198855396535#!/compare/1590451200/1592611200

https://backpack.tf/profiles/76561198337734785#!/compare/1590364800/1590451200

Qs.

Sale 12: https://backpack.tf/profiles/76561198337734785#!/compare/1592524800/1592611200

https://backpack.tf/profiles/76561198091502579#!/compare/1592524800/1592611200

Qs.

Sale 13: https://marketplace.tf/items/tf2/30357;5;u62 - 60/1.85 = ~32

https://backpack.tf/item/3902248042

Sale 14: https://marketplace.tf/items/tf2/30357;5;u62 - 60/1.99 = ~30

https://backpack.tf/item/3902248042

Sales: 18, 19, 23, 23?, 26, 28, 30 and 32. Classies: https://i.imgur.com/uf1FgpE.png. 23-32.