Many thx to Easy Peasy for his guidance and additional sales :) Re-suggested as requested:

Sold for 400 pure plus Pugilists protector knifestorm Screenies/History and supporting mini's below.

Screenie: https://imgur.com/a/JfpBidU

Compare: https://backpack.tf/profiles/76561198210673328#!/compare/NaN/1658361600

History: https://backpack.tf/item/2045879881

Mini for Pug sale 1: https://backpack.tf/profiles/76561198339336870#!/compare/1660176000/1660262400 - seems to be same price range

Mini for Pug sale 2: https://backpack.tf/profiles/76561198045749377#!/compare/1660176000/1660262400

https://backpack.tf/profiles/76561198339336870#!/compare/1660176000/1660262400 - This was the Harvest Moon (250) + Unusualifier (~12) + 106 keys = 368

https://backpack.tf/profiles/76561198056793885#!/compare/1659484800/1659571200 - This supports

So the Demonflame Private Eye sold for Pug (368) + 400 keys = 768 keys

Could you please close this one and remake one at 770 keys with the sales from the Pug (including the ones you found, thanks for doing that!) :D (Done!)