Deadly Rotations.

http://backpack.tf/item/4526816634

Sale 1) Sold + Strange Pro KS AWPer Hand (~12.5 Keys) for a Death at Dusk Boxcar Bomber (185 Keys) + Dead of Night (1 Key)

http://backpack.tf/profiles/76561198057379746#!/compare/1475366400/1476403200

(185 + 1) - 12.5 = 173.5 Keys. This sale is a high outlier because of the lower sales and 2 Unsolds at 150 Keys.

Boxcar Mini

http://backpack.tf/profiles/76561198105525229#!/compare/1476057600/1476144000 - Sold for an Atomic Captain Space Mann (185 Keys)

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Sale 2) Sold + Blizzardy Storm Tough Stuff Muffs (75 Keys) for a Death at Dusk Winter Woodsman (220 Keys)

http://backpack.tf/profiles/76561198066195760#!/compare/1477353600/1477440000 - Seller's Backpack

http://backpack.tf/profiles/76561198043075767#!/compare/1477353600/1477440000 - Buyer's Backpack

220 - 75 = 145 Keys

Woodsman Mini

http://www.tf2outpost.com/trade/28253687 - 4 Months Unsold at 220 Keys

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http://backpack.tf/item/4579942978

Sale 3) Sold + Green Confetti Pencil Pusher (39 Keys) for a Blizzardy Storm Virtual Viewfinder (177 Keys) + Kill-a-Watt Titanium Tyrolean (13 Keys)

http://backpack.tf/profiles/76561198175249965#!/compare/1471651200/1471737600

(177 + 13) - 39 = 151 Keys, which rounds to 150 Keys

Viewfinder Mini

Sold + 7 Keys for a Disco Beat Down Well-Rounded Rifleman (93.5 Keys) + Sunbeams Defiant Spartan (90 Keys)

http://backpack.tf/profiles/76561198105403049#!/compare/1472860800/1472947200 - Buyer's Backpack

https://backpack.tf/profiles/76561198175249965#!/compare/1472860800/1472947200 - Seller's Backpack

(93.5 + 90) - 7 = 176.5, which rounds to 177 Keys.

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http://www.tf2outpost.com/trade/28141726 - 5 Months Unsold at 150 Keys

http://www.tf2outpost.com/trade/28180639 - 5 Months Unsold at 150 keys