Free suggestion courtesy of Mindacosine

Sold for a Miami Nights Federal Casemaker(71 Keys) and ~1 Key in Sweets(72 Keys total, Outlier)

https://backpack.tf/profiles/76561198192602363#!/compare/1520208000/1520294400

Sold with ~2 Keys in Sweets for a Sunbeams Grenadier's Softcap(55 Keys)(53 Keys total, Outlier)

https://backpack.tf/profiles/76561198053747026#!/compare/1520208000/1520294400

Sold for a Scorching Flames Demoman's Fro(57 Keys)(Credits to Discovery for the sale!)

https://backpack.tf/profiles/76561198107934426#!/compare/1521417600/1521763200

Sold for an Orbiting Planets Powdered Practitioner(14 Keys), an Australium Spec KS Rocket Launcher(~34 Keys) and a Max's Severed Head(~18.5 Keys, round to 19)(67 Keys total)

https://backpack.tf/profiles/76561198107934426#!/compare/1520467200/1520812800

https://backpack.tf/profiles/76561198123899074#!/compare/1520726400/1520812800

Cutting both the low sale(53) and the high sale(72) from the range, median is essentially the same. 57-67.