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Only valid sale that I found.
Sale 1: Sold with Mallard Mongolian[20 keys] for Duped Miami Nights Ballcap[44.5 keys via mini]
http://backpack.tf/profiles/76561198134561631?time=1430463600
http://backpack.tf/profiles/76561198134561631?time=1430722800
44.5*0.9=40.05 rounding to 40
40-20=20
Mini on Ballcap: Sold for Smoking Exclusive[44.5 keys]
http://backpack.tf/profiles/76561198027176461?time=1429167600
http://backpack.tf/profiles/76561198027176461?time=1429254000
Taking final price as 20 keys