Party Hearty.

https://backpack.tf/item/5026710794

Sale 1) Sold for 67 Keys

https://backpack.tf/profiles/76561198197516958#!/compare/1489276800/1489363200

https://backpack.tf/item/3326024928

Sale 2) Sold for a Morning Glory Hermes + Neutron Star Frickin' Sweet Ninja Hood + Starstorm Insomnia Modest Metal Pile of Hat

https://backpack.tf/profiles/76561198080179568#!/compare/1489881600/1489968000

http://www.tf2outpost.com/trade/28831863 - Capped by Buyout of 80 Keys

https://backpack.tf/item/5070890745

Sale 3) Sold + Strange Secret to Me Smokey for a PE Human Cannonball + ~22 Keys of Items + 14 Keys

https://backpack.tf/profiles/76561198043992035#!/compare/1485302400/1485388800

High Outlier.

Sale 4) Sold for a BS Hot Brain Candy Pistol

https://backpack.tf/profiles/76561198144280236#!/compare/1486598400/1486684800

Probably could be used to price the Pistol.

Sale 5) Sold for a Frostbite Reggaelator (80 Keys) + ~1 Key of Items

https://backpack.tf/profiles/76561198002186909#!/compare/1487116800/1487203200

80 + 1 = 81 Keys

Sale 6) Sold for a Stormy Storm Coldsnap Cap + Max's Severed Head + ~0.5 Keys of Items

https://backpack.tf/profiles/76561198112412669#!/compare/1487030400/1487203200

Fits in the range.