Resuggesting this freebie from Lemons as there was a bit more to the trade!

Sale 1)

https://backpack.tf/profiles/76561198850407517#!/compare/1729900800/1729987200 - Sold for a Soulful Slice Rotation Sensation (150) + a Miami Nights Crit Cloak (63) + a Vicious Vampires Warhood (27, no sales there) + a Spectral Fire Field Practice (No sales, taking 66) + a Spectral Fire Blast Defense (255) + 50 pure (see below) = 611 keys

Buyout was 850 keys https://gyazo.com/5f8928b14998a0de57bd90197c02d282 / https://gyazo.com/001f20ae958b115984d7ccbb1da74f37

Comment from absalonn on previous suggestion:

"one other thing is there were 50 keys pure included in that deal, traded seperatly after the buyer got all the keys

https://snipboard.io/9othUx.jpg

so this should be 610 unless warhood/fp/ blast get other sales"

Compare showing additional keys: https://backpack.tf/profiles/76561198850407517#!/compare/1729987200/1730073600

Only sale:

611

Rounding to 610 for neatness