Out of Tune

http://backpack.tf/item/5123402851

Sale 1) Sold for a Miami Nights A Hat to Kill For (28.5 Keys)

http://backpack.tf/profiles/76561198010569914#!/compare/1478217600/1478304000

Rounding to 29 Keys

A Hat to Kill For Mini

Sold for a Professional Killstreak Australium Ambassador (~17 Keys) + Australium SMG (7.5 Keys) + 4 Keys

http://backpack.tf/profiles/76561198252752536#!/compare/1478217600/14783040000

Sale 2) Sold for a Blizzardy Storm Dr's Dapper Topper (39.5 Keys)

http://backpack.tf/profiles/76561198252752536#!/compare/1478304000/1478390400

Rounding to 40 Keys

Sale 3) Sold + 2 Keys for an Orbiting Fire Flipped Trilby + ~10 Keys of Items

http://backpack.tf/profiles/76561198319884147#!/compare/1479945600/1480032000 - Buyer's Backpack

http://www.tf2outpost.com/trade/28627621 - The Buyer relisted it at 22 Keys, so I'll cap the sale at that.

Sale 4) Quicksold for 21 Keys

http://backpack.tf/profiles/76561198065425005#!/compare/1480032000/1480118400 - Buyer's Backpack

Calling 40 Keys high.