Thank you "Shadowman" for your help. http://backpack.tf/profiles/76561198072297252

Sale 1

Before: http://backpack.tf/profiles/76561198093629892?time=1431402651

After: http://backpack.tf/profiles/76561198093629892?time=1431759600

Sold for a bunch of taunts, looks irrelevant.

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Sale 2

Before: http://backpack.tf/profiles/76561198076069930?time=1430636400

After: http://backpack.tf/profiles/76561198076069930?time=1430722800

Sold for a kill-a-watt big chief (~10.5) 10.5*0.9 = 9.45 rounding to 9

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Sale 3

Before : http://backpack.tf/profiles/76561198100851805?time=1431088244

After: http://backpack.tf/profiles/76561198100851805?time=1431241200

Sold with Collector's prof ks brass beast for a Aus.Tomislav worth 9. Is an outlier.

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Sale 4 Duped

http://backpack.tf/profiles/76561198067306890?time=1433228400 before

http://backpack.tf/profiles/76561198067306890?time=1433746800 after

9.8 keys in cosmetics -> 9.8*0.9 = 8.82 rounding to 9.

Duped is used to support the second sale.