can’t make a range with 1 sale, plus BoA at 340 keys is in date so salty + 81 would make the salty around 260 keys value wise I believe

not sure where you got 290 - 325 from

1 sale = 1 price

2+ sales at different prices = range

As mentioned in the comments, you can't have a range with one sale. In addition, there are also many more sales that need to be considered, I've linked all the histories with recent sales:

https://backpack.tf/item/13154360076

https://backpack.tf/item/13154360076

https://backpack.tf/item/11887039189

https://backpack.tf/item/11821529579

https://backpack.tf/item/11131203724

https://backpack.tf/item/728918587

If you need help feel free to ask in #suggestion-discussion in the backpack.tf discord. For now, this should be closed.