Card Swipe

http://backpack.tf/item/4457756969

Sale 1) Sold + 1 Key for a Green Energy Copper's Hard Topper (21 Keys)

http://backpack.tf/profiles/76561198065124166#!/compare/1454400000/1454486400

21 - 1 = 20 Keys

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http://backpack.tf/item/3765368866

Sale 2) Sold for a Professional Killstreak Australium Black Box (27 Keys)

http://backpack.tf/profiles/76561198045354273#!/compare/1456560000/1456646400

Sale 3) Sold for a Sunbeams Hard Counter (31.5 Keys), which rounds to 32 Keys

http://backpack.tf/profiles/76561198007850070#!/compare/1459209600/1459296000

Sale 4) Sold for a Disco Beat Down Waxy Wayfinder (28 Keys) + 5 Keys + ~0.5 Keys of Refined

http://backpack.tf/profiles/76561198092471230#!/compare/1461542400/1461628800

28 + 5 + 0.5 = 33.5 Keys, which rounds to 34 Keys

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Ruling Sale an Outlier because this person declined 21 - 22 Keys

http://www.tf2outpost.com/trade/28113400