Resuggestion (credit to truly humble under god & shuffle)

Item History:

https://backpack.tf/item/210900467

Compare:

https://backpack.tf/profiles/76561198870492523#!/compare/1786665600/1787875200

(does not show the remaining 125 keys that was also in trade for some reason)

1000 keys

Trade history:

https://imgur.com/a/HvoJhJ8

New sale:

https://backpack.tf/item/210828191

https://backpack.tf/profiles/76561198977417516#!/compare/1788652800/1789516800

https://backpack.tf/profiles/76561198134397080#!/compare/1788998400/1789516800

Sold for 1100 keys

https://backpack.tf/profiles/76561198870492523#!/compare/1791072000/1791590400 - Sold for 1325 Keys

1000 - 1325 would work.