Credits to Shuffle Spy!

https://backpack.tf/profiles/76561199055386504#!/compare/1639958400/1640304000 - 57 Keys

https://backpack.tf/profiles/76561198277020272#!/compare/1640390400/1640476800 - Massed Flies Luchadore + Pristine Pine Didgeridrongo

https://backpack.tf/profiles/76561198177838739#!/compare/1640304000/1640476800 - The Flies Luchadore was immediately dumped for 65 Keys, so you could count its value as 65 Keys

https://backpack.tf/profiles/76561198236061140#!/compare/1640908800/1641081600 - Pro KS Strange Double-Spelled Flame + 20 Keys

https://backpack.tf/profiles/76561198175901775#!/compare/1640908800/1640995200 - The Flame previously sold for 32 Keys

Sale 1 looks like 68 Keys to me, so 57 - 68 could work as a range here.

https://backpack.tf/item/534576247

https://backpack.tf/profiles/76561198048792033#!/compare/1639699200/1639785600

https://backpack.tf/profiles/76561198161368107#!/compare/1639612800/1639785600

https://gladiator.tf/listings/61bd25918636fa8dc9d51cd8

looks to be 67k 68k

https://backpack.tf/profiles/76561198161368107#!/compare/1639785600/1639958400

https://backpack.tf/profiles/76561199055386504#!/compare/1639699200/1639958400

bulk for cloudy moon outdoorsman

https://backpack.tf/item/765602075

https://backpack.tf/profiles/76561198099098829#!/compare/1637971200/1638144000

https://backpack.tf/profiles/76561198236061140#!/compare/1637971200/1638057600

looks to be 65k + small sweets

57-68.