Because i don't make a mini if i find 2 sales.

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Sale #1 17th - 18th of September

http://backpack.tf/profiles/76561198091292975?time=1442473200

http://backpack.tf/profiles/76561198091292975?time=1442559600

10 keys+G.Dragonborn(1)+SKS S.Backburner(~0.7)+Painted V.Brigade(0.7, most likely involved)+SubZero(0.9)+Aus.Gold Frickin Hood(0.5) 10+(1+0.7+0.7+0.9+0.5=3.8) = 10+ (3.8*0.9=3.42 ->3) = ~13

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Sale #2 15th - 21st of September

http://backpack.tf/profiles/76561198113483404?time=1442300400

http://backpack.tf/profiles/76561198113483404?time=1442818800

12 keys? Metal was used to buy other things(histories). Due to blackhole i can't say for sure, assuming he paid 12, other's side's bp is a mess aswell.

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All that i could find without premium, this sounds about right.