Cauldron Bubbles Company Man (48)
https://backpack.tf/stats/Unusual/Company%20Man/Tradable/Craftable/39

Sale 1)
https://backpack.tf/item/544124543 + https://marketplace.tf/items/tf2/523;5;u39 - Sold for $89 / $1.85 = 48 Keys
No Buyout

The other Mp.tf sale was for a Duped - https://backpack.tf/item/566174549

Summary:
48

Took a while too