The Severed Head of Princess Peach's Army

http://backpack.tf/item/5256785445

Sale 1) Sold for a Power Surge Barnstormer

http://backpack.tf/profiles/76561198342161127#!/compare/1484092800/1484179200

http://www.tf2outpost.com/trade/28707677 - Capped by the Buyout of 32 Keys

http://backpack.tf/item/5205876073

Sale 2) Sold for 32 Keys

http://backpack.tf/profiles/76561197964171516#!/compare/1484438400/1484524800

http://backpack.tf/item/5213724009

Sale 3) Sold for a Power Surge Whoopee Cap

http://backpack.tf/profiles/76561198018101085#!/compare/1484438400/1484611200

No good Mini for the Whoopee Cap. Best used for that.

http://backpack.tf/item/5203276578

Sale 4) Sold for a Vivid Plasma Airdog (19 Keys) + Strange PDA (7.6 Keys) + 2 Keys

http://backpack.tf/profiles/76561198119634686#!/compare/1484870400/1484956800

19 + 7.6 + 2 = 28.6, which rounds to 29 Keys

Airdog Mini

http://backpack.tf/profiles/76561198072037246#!/compare/1482451200/1482537600 - Sold for a Max’s (~19 Keys)

http://backpack.tf/item/5214721625

Sale 5) Sold for 30 Keys

http://backpack.tf/profiles/76561198090956917#!/compare/1486684800/1486771200

http://backpack.tf/item/5265134725

Sale 6) Sold for 25 Keys

http://backpack.tf/profiles/76561198044934255#!/compare/1487289600/1487376000