https://backpack.tf/item/14902867947

https://backpack.tf/profiles/76561198089253101#!/compare/1768435200/1768521600

https://backpack.tf/profiles/76561199121446560#!/compare/1768521600/1768435200

28 keys

https://backpack.tf/profiles/76561198205864060#!/compare/1767657600/1768003200

24.5 keys - I bought on auction https://imgur.com/a/S3Dl95x

https://backpack.tf/profiles/76561198163609625#!/compare/1766448000/1766620800

https://backpack.tf/profiles/76561198205864060#!/compare/1766448000/1766620800

Untrace likely sold for ~30 Keys. If this is the case, then it doesn't really matter since it got dumped for less per the auction. But it can be argued as a point against the 24.5 sale.

https://backpack.tf/profiles/76561198071566056#!/compare/1768608000/1768694400

https://backpack.tf/profiles/76561199121446560#!/compare/1768608000/1768694400

Sold for a Max's Severed Head (Resold for 26 Keys) and a Genuine Pro KS Three-Rune Blade (Resold for ~7 Keys) (33 Keys total)

Taking 28-33, thanks Mindacos for input