Tears

http://backpack.tf/item/1474416653

Sale 1) Sold for 55 Keys

http://backpack.tf/profiles/76561198028721790#!/compare/1490313600/1490832000 - Buyer's Backpack

http://backpack.tf/item/1107637815

Sale 2) Sold for 43 Keys

http://backpack.tf/profiles/76561198114232885#!/compare/1491782400/1491868800

http://backpack.tf/item/5464825813

Sale 3) Sold for a Duped Searing Plasma Charmer's Chapeau

http://backpack.tf/profiles/76561198152087289#!/compare/1485475200/1485561600

There is no Mini for the Chapeau.

Sale 4) Sold for a Mega Strike Party Trick (35 Keys) + 1 Key

http://backpack.tf/profiles/76561198071041124#!/compare/1485820800/1485907200

35 + 1 = 36 Keys

Sale 5) Sold + Green Confetti Frenchman's Beret (16 Keys) for a Circling Hearts Flipped Trilby (37.5 Keys) + Duped Blizzardy Storm Bonk Boy (37 Keys)

http://backpack.tf/profiles/76561198179707937#!/compare/1487980800/1488067200

37.5 + 37 = 74.5 - 16 = 58.5, which rounds to 59 Keys

Trilby Mini

http://backpack.tf/suggestion/58f5813e0e2cad7fa27bb0c7 - 37.5 Keys

Bonk Boy Mini

http://backpack.tf/profiles/76561198126204929#!/compare/1486598400/1486684800 - Sold for a Spec KS Aussie Rocket (40 Keys) + Collector's Buff (~4 Keys)

http://backpack.tf/profiles/76561198258167721#!/compare/1488585600/1488672000 - Sold for a Duped PE Toque (30 Keys)

Toque Micro

http://backpack.tf/profiles/76561198072238182#!/compare/1489622400/1489708800 - Sold for an Atomic Universal Translator (~30 Keys)

Translator Macro

http://imgur.com/a/X4R7R - Taking 30 Keys.

Sale 6) Sold for 44 Keys

http://backpack.tf/profiles/76561198139291293#!/compare/1488499200/1488585600

Sale 7) Sold for a Specialized Killstreak Australium Rocket Launcher (~40 Keys)

http://backpack.tf/profiles/76561198197261851#!/compare/1489017600/1489104000 - Seller's Backpack

http://backpack.tf/profiles/76561198070688101#!/compare/1489017600/1489104000 - Buyer's Backpack

Sale 8) Sold for a Blizzardy Storm Danger (45 Keys)

http://backpack.tf/profiles/76561198070688101#!/compare/1489017600/1489104000 - Seller's Backpack

Danger Mini

http://backpack.tf/suggestion/58f56b3de338777d724a5d43 - 45 Keys

Sales at: 55, 43, 36, 59, 44, 40, 45

Counting 36 as low and 59 high, but using 59 to support 55.