https://backpack.tf/item/8310973733 - Fresh unbox

https://backpack.tf/item/6894145741 - 2 Sales

https://backpack.tf/item/6946770465 - No indate sale

https://backpack.tf/item/10042436657 - No indate Sale

https://backpack.tf/item/4236626115 - No indate Sale

https://backpack.tf/item/7696531610 - No indate sale

https://marketplace.tf/items/tf2/30647;5;u96

--Sale 1--

44.99/1.83 = 24.5

--Sale 2--

44.99/1.89 = 23.8

--Sale 3--

44.99/1.79 = 25.1

https://mannco.store/item/20278

--Sale 4--

45/1.67 = 26.9

--Sale 5--

18 Keys and 41 Refined

https://backpack.tf/profiles/76561198074479778#!/compare/1634774400/1635724800

https://backpack.tf/profiles/76561198376885782#!/compare/1635638400/1635811200

--Sale 6--

https://backpack.tf/profiles/76561198376885782#!/compare/1635638400/1635811200

https://backpack.tf/profiles/76561198039442850#!/compare/1635638400/1635984000

Sold for a Electric Hat Protector Phononaut + 3 Keys

Mini for Electric Hat Protector Phononaut

https://mannco.store/item/22567

36.99/1.68 = 22 Keys

So he sold it for 25 Keys.

Sale at 18 Keys can be rounded to 19

Sale at 24.5 can be rounded to 25

Sale at 23 can be rounded to 24

Sale at 25 rounded to 25

Sale at 26.9 can be rounded to 27.

This gives us the range of 19-27 which would be too much of a gap, With 19-24 being the closest. Making the range be 24-27 Keys which is a more reasonable range. Classifieds are very close to new suggestion.