https://marketplace.tf/items/tf2/30874;5;u199

225/1.9 = 118 Keys

https://backpack.tf/item/10821356258

Untraceable sales. If anyone are able to find them it'll be helpful. Until then the only sale currently found is @118 Keys

As Shuffle Spy pointed out another sale was a blast defense which was traded multiple times with the owner.

"https://backpack.tf/profiles/76561198048792033#!/compare/1634601600/1634688000 - The untraceable sale was an SCM sale for something

https://backpack.tf/profiles/76561198091442194#!/compare/1633910400/1633996800 - Sold for a Sunbeams Blast Defense

https://backpack.tf/profiles/76561198310947290#!/compare/1634169600/1634428800 - ?

Since the Blast Defense was traded back and forth between the buyer and seller a few times, that sale shouldn't be used here."