https://backpack.tf/item/2494961492 Likely the item history of the first sale.

You can't claim stn sales sold for the amount they did without comparison links. Their prices change very often, and it's very likely they don't match the actual sale.

The first stn sale seems to have been sold with a Screaming Tiger Conga for 36 Keys

https://backpack.tf/profiles/76561197962720823#!/compare/1741996800/1742342400

https://backpack.tf/profiles/76561199581722058#!/compare/1741996800/1742083200

The second stn sale seems to have been for 15 Keys 34 Ref, which rounds down to 15 Keys

https://backpack.tf/profiles/76561199569633180#!/compare/1745366400/1745452800

This is NOT a quicksell, as this is stn SELLING the Trilby, NOT buying it.

The third stn sale is untraceable:

https://backpack.tf/profiles/76561199569633180#!/compare/1745539200/1745625600

18 flat will be too high as there's an active seller for 17 Keys. 15 might be what buyers are buying for, but it seems to be a common enough trading point where it needs to be included, if we can assume that the other two stn sales fall around the same value.

This should be resuggested at 15-18.