Also needs a drop.

Sold for a Nuts & Bolts Heavy Duty Rag(9 Keys with Overpay) and ~4 Keys in Sweets(13 Keys total)

http://backpack.tf/profiles/76561198070443280?time=1436252400 (July 7th)

http://backpack.tf/profiles/76561198070443280?time=1436338800 (July 8th)

Sold for an Orbiting Fire Sober Stuntman(11 Keys with Overpay)

http://backpack.tf/profiles/76561198091213495?time=1439190000 (August 10th)

http://backpack.tf/profiles/76561198091213495?time=1439276400 (August 11th)

http://www.tf2outpost.com/item/440,4066001982,120,5 Stovepipe History

Sold for a Stormy Storm Nanobalaclava(12 Keys with Overpay)

http://backpack.tf/profiles/76561198048050285?time=1433228400 (June 2nd)

http://backpack.tf/profiles/76561198048050285?time=1433314800 (June 3rd)

Sales seem to fit, 11-13 Keys should be fine.

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