Hot Bone

https://backpack.tf/item/7355535082

Sale 1) Sold for 29 Keys + Killstreak Silver Botkiller Rocket Launcher Mk.I

https://backpack.tf/profiles/76561198282480255#!/compare/1558742400/1558828800

Low outlier.

Sale 2) Sold + Vivid Plasma Universal Translator for a Strange Minimal Wear Isotope Butcher Bird Grenade Launcher

https://backpack.tf/profiles/76561198137799038#!/compare/1558742400/1558915200

https://backpack.tf/suggestion/5d12730b67807219e4338824 - This sale was used for the Butcher Bird.

Sale 3) Quicksold for 45 Keys

https://cdn.discordapp.com/attachments/528803965022896146/604035656515321877/1564083699156.jpg - Thanks, Reflex

Sale 4) Sold for a Roboactive Nanobalaclava (72.5 Keys) + 10 Keys

https://backpack.tf/profiles/76561198342476957#!/compare/1562457600/1563062400

https://cdn.discordapp.com/attachments/528803965022896146/604035656515321881/1564083713288.jpg - Thanks, Reflex

72.5 + 10 = 82.5, which rounds to 83 Keys

Roboactive Nanobalaclava Mini

https://backpack.tf/suggestion/5d39fc006780720af67c3849 - 72.5 Keys