Needs a drop.

Sold for an Australium SMG(9 Keys with Overpay at the time) and 1 Key(10 Keys Total)

http://backpack.tf/profiles/76561198117948497?time=1425994628

http://backpack.tf/item/1367772775 Tam History

Sold for an Orbiting Planets Private Eye(11 Keys with Overpay)

http://backpack.tf/profiles/76561198117451303?time=1420876800 -> http://backpack.tf/profiles/76561198117451303?time=1420997775

Sold for a Bubbling Magistrate's Mullet(11 Keys with Overpay, B/O was 10)

http://backpack.tf/profiles/76561198119133838?time=1425456000 -> http://backpack.tf/profiles/76561198119133838?time=1425542400

http://www.tf2outpost.com/trade/25272508

Sales seem to fit, 10-11 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.