item1:

https://backpack.tf/item/13224243098

sale1:

https://backpack.tf/profiles/76561198170108197#!/compare/1701302400/1701388800

https://backpack.tf/profiles/76561198310972287#!/compare/1701216000/1701302400

bulk to Anti-Freeze Brainiac Hairpiece

sale2:

https://backpack.tf/profiles/76561198310972287#!/compare/1701561600/1701648000

https://backpack.tf/profiles/76561198191854982#!/compare/1701475200/1701561600

?

sale3:

https://backpack.tf/profiles/76561198191854982#!/compare/1701734400/1701907200

https://backpack.tf/profiles/76561198013925436#!/compare/1701734400/1701907200

Team Spirit Footprints unu hat + 1 key

https://marketplace.tf/items/tf2/31333;5;u14

sale1:

2023-09-25

130/2.02=64.35643

64 keys

https://i.imgur.com/FJMOd8l.png - Sale 2 was a bulk sale

Sale 3 can be used if you find sales for the spelled version of the Kabuto that are consistently higher than the non-spelled version. If the sales are equivalent to those for the non-spelled version, treat them equally. In this case, the spelled sales are:

https://backpack.tf/profiles/76561198079821428#!/compare/1697760000/1698278400 - 55 Keys

https://backpack.tf/profiles/76561198261483133#!/compare/1699142400/1699228800 - Tesla Coil Voodoo Juju + 3 Keys (no other traceable sales)

https://backpack.tf/profiles/76561198013925436#!/compare/1701129600/1701216000 - Spelled Miami Nights Pillar + 15 Keys

The Pillar sale shouldn't be used because I genuinely don't know what to think about its other two sales

https://backpack.tf/profiles/76561198065903789#!/compare/1699660800/1699833600 - Paid 110 Keys

https://backpack.tf/profiles/76561198013925436#!/compare/1699660800/1699920000 - Added 16 Keys for a ROFP Orb. Fire Brain Bucket

That'll make the third sale 56 Keys here. That should be your low end.

Shuffle Spy

56-64