Suggestion spree. Credits to Hilbert-WARing Axiom for the info on Cosa sale.

Sales

1) Sold for a Cloudy Moon Heavy Duty Rag (45.5 keys)

http://backpack.tf/profiles/76561198046429263?time=1440054000 (Aug 20th vs 21st)

I have no idea who offered what, as this trade closed 3 weeks before the sale: http://www.tf2outpost.com/trade/26646663

Doing maths: X= 45.5*0.9= ~41 keys

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2) Sold for a Stormy 13th Hour Détective Noir (53 keys) + 10 keys ----- Capped at 50 keys

http://backpack.tf/profiles/76561198095335435?time=1441695600 (Sep 8th vs 9th)

http://www.tf2outpost.com/trade/26965890

Not applying overpay on this one, the B/O cap is some kind of overpay rule i think.

No moar sales i could find, so 41-50 keys it is.

Criticism appreciated!