— Scrap Auction Sale —

https://scrap.tf/auctions/I1L63O - 2 Keys 16.66 Ref

Could not find Item History :/

— Gladiator Stats —

May - 4 Keys (4)

https://gladiator.tf/sales?item=Runic%20Imprisonment%20Taunt:%20Yeti%20Punch&at=2023-05-26T03:11:10.452Z

April - Empty

https://gladiator.tf/sales?item=Runic%20Imprisonment%20Taunt:%20Yeti%20Punch&at=2023-04-26T03:11:10.452Z

March - Empty

https://gladiator.tf/sales?item=Runic%20Imprisonment%20Taunt:%20Yeti%20Punch&at=2023-03-26T03:11:10.452Z

February - 3 Keys (3) and 2 Keys 36 Ref (2.45)

https://gladiator.tf/sales?item=Runic%20Imprisonment%20Taunt:%20Yeti%20Punch&at=2023-02-26T03:11:10.452Z

— Unusable Sales —

https://backpack.tf/profiles/76561199061291714#!/compare/1678406400/1678665600 - Too Many Sales

https://backpack.tf/profiles/76561199161916038#!/compare/1678406400/1678579200 - Too Many Sales

https://backpack.tf/profiles/76561199161916038#!/compare/1678579200/1678665600 - Too Many Sales

https://backpack.tf/profiles/76561199061291714#!/compare/1678665600/1679529600 - Too Many Sales

Item History - https://backpack.tf/item/12241583890

— Unusable Marketplace.tf Sale —

Unu May 19: 14.99 || Key May 19: 2.02 || Total - 7.5

Runic Imprisonment Yeti Punch -

https://marketplace.tf/items/tf2/1182;5;u3095

Mann Co. Supply Crate Key -

https://marketplace.tf/items/tf2/5021;6

— Conclusion —

There is a seller in Marketplace for $8.99 so the sale of $14.99 seems like an Outlier. https://imgur.com/a/hI6LDid

I think 2.2 - 4 would work best here.