Sale #1:

https://backpack.tf/item/14847638152

https://backpack.tf/profiles/76561199202110112#!/compare/1751328000/1751500800 ~ 75 keys match

https://backpack.tf/profiles/76561198074992626#!/compare/1751328000/1751587200

Also double confirmed by this https://gladiator.tf/sales?item=Cuban%20Smoke%20Fire%20Marshal&at=2025-08-19T13:23:04.069Z

Sale #2:

https://backpack.tf/item/14766312024

https://backpack.tf/profiles/76561198094975766#!/compare/1752969600/1753747200 ~ added 8 keys for a treasure trove close quarters

https://backpack.tf/profiles/76561198898142735#!/compare/1753401600/1753833600

Mini close:

https://backpack.tf/suggestion/68a152d8dfbf2662d009743c ~ 64

64 - 8 = 56

Sale #3:

https://backpack.tf/item/14959479778

https://backpack.tf/profiles/76561198047704729#!/compare/1753488000/1753574400 ~ gaze matches

https://backpack.tf/profiles/76561198061440669#!/compare/1753228800/1753574400 ~ bulk for strange beams gaze

Sale #4:

https://backpack.tf/profiles/76561197964195441#!/compare/1748304000/1748390400 ~ 75 keys pure

https://backpack.tf/profiles/76561198047704729#!/compare/1748304000/1748563200

Sales @ 56, 75, 75

With 70 unsold for 2 months, 22 days and 6 days (and 3 sellers at it), it makes no sense to take 75 flat, so taking 56-75 makes the most sense.