I've got a bad reputation...

https://www.youtube.com/watch?v=pMWJb0YsJ8E

http://backpack.tf/item/4460970522

Sale 1) Sold for 20 Keys

http://backpack.tf/profiles/76561197998473620#!/compare/1460937600/1461369600

Sale 2) Sold for a Haunted Ghosts Trash Man (25.5 Keys)

http://backpack.tf/profiles/76561198004089472#!/compare/1461542400/1461801600

http://www.tf2outpost.com/trade/28103503 - Capped by the Buyout of 25 Keys

Sale 3) Sold for a Strange Professional Killstreak Kritzkreig (20 Keys)

http://backpack.tf/profiles/76561198072326844#!/compare/1461715200/1461801600

Sale 4) Sold for 23 Keys

http://backpack.tf/profiles/76561198164814063#!/compare/1463961600/1464480000

Sale 5) Sold + Specialized Killstreak Australium Wrench (~25 Keys) for a Circling Hearts Reggaelator (49 Keys)

http://backpack.tf/profiles/76561198068015503#!/compare/1464480000/1464566400

49 - 25 = 24 Keys

Sale 6) Sold for a Darkblaze Stately Steel Toe (Outdated at 25 Keys)

http://backpack.tf/profiles/76561198057213302#!/compare/1464652800/1464739200

http://www.tf2outpost.com/trade/28214335 - Capped by the Buyout of 25 Keys. The Sale can't be any more than 25, and I doubt the Toe less than 20.

Sale 7) Sold for 21 Keys + ~8 Keys of Items

http://backpack.tf/profiles/76561198053109402#!/compare/1464652800/1464739200 - Buyer's Backpack

21 + 8 = 29 Keys

29 Keys could be considered an Outlier, but because it's close enough to the other sales, I'll include it. Tell me if I shouldn't.