http://backpack.tf/item/440164286

Sale 1) Quicksold for 27 Keys

http://backpack.tf/profiles/76561198049884052#!/compare/1482624000/1482796800

http://backpack.tf/item/1951825846

Sale 2) Quicksold for 30 Keys

http://backpack.tf/profiles/76561198096389539#!/compare/1483660800/1483747200

http://backpack.tf/item/1362574646

Sale 3) Quicksold? For 27 Keys

http://backpack.tf/profiles/76561198057144077#!/compare/1484179200/1484697600

Sale 4) Sold for a Blizzardy Storm Thirst Blood (28.5 Keys) + ~4.7 Keys of Items

http://backpack.tf/profiles/76561198064423172#!/compare/1484870400/1484956800

28.5 + 4.7 = 33.2, which rounds to 33 Keys

http://backpack.tf/item/1110868704

Sale 5) Sold for 29 Keys + ~1 Key of Refined

http://backpack.tf/profiles/76561198125404376#!/compare/1480118400/1480204800

29 + 1 = 30 Keys

Sale 6) Sold + 6 Keys for a Hellish Inferno Box Trot (40 Keys)

http://backpack.tf/profiles/76561198056531196#!/compare/1481328000/1481414400 - Seller’s Backpack

http://backpack.tf/profiles/76561197995194055#!/compare/1481328000/1481414400 - Buyer’s Backpack

40 - 6 = 34 Keys

Sale 7) Sold for 30 Keys

http://backpack.tf/profiles/76561197995194055#!/compare/1481932800/1482192000

Sale 8) Sold for 26 Keys

http://backpack.tf/profiles/76561198002757046#!/compare/1482624000/1482710400

Low because of Classified Buyers.

Sale 9) Sold for 29 Keys

http://backpack.tf/profiles/76561198048008254#!/compare/1482796800/1482883200

Sale 10) Sold for 36 Keys

http://backpack.tf/profiles/76561198108628484#!/compare/1486944000/1487030400 - Buyer’s Backpack

http://imgur.com/a/jTi7C - Credits to Mr.Darkness