Looking at this item: https://backpack.tf/item/1648253114

Sale #1

seller: https://backpack.tf/profiles/76561198107845125#!/compare/1591228800/1591401600

buyer: https://backpack.tf/profiles/76561198135388328#!/compare/1591315200/1591401600

Sold for 12 keys.

Look for the trade with 8871663709 in seller compare.

Sale #2

seller: https://backpack.tf/profiles/76561198135388328#!/compare/1591401600/1591488000

buyer: https://backpack.tf/profiles/76561197964171516#!/compare/1591401600/1591488000

Looks like it was 13 keys but key histories are all messed up. Tho is would make sens that Scrap.tf would have bought it for 12 and sold for 13.

Look for the trade with 8873965834 in seller compare.

Sale #3

seller: https://backpack.tf/profiles/76561197964171516#!/compare/1593820800/1593907200

buyer: https://backpack.tf/profiles/76561198954470051#!/compare/1593820800/1593993600

untrace

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NO Marketplace.tf SALES

https://marketplace.tf/items/tf2/251;5;u66

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Since the current seller is at 18 keys and 12 keys seems low, I'd keep sale #2 in the range even tho it isn't certain.

Range should be reviewed if'n a new sale comes up.

12-13 keys.