Still needs a drop.

Sold for a Smoking Magnificent Mongolian(9 Keys with Overpay)

http://backpack.tf/profiles/76561198149313875?time=1438930800 (August 7th)

http://backpack.tf/profiles/76561198149313875?time=1439017200 (August 8th)

http://www.tf2outpost.com/item/440,3915864798,313,5 Mongolian History

Sold for a Gifted Kill-a-Watt Janissary Ketche(10 Keys with Overpay)

http://backpack.tf/profiles/76561198113302325?time=1437289200 (July 19th)

http://backpack.tf/profiles/76561198113302325?time=1437462000 (July 21st)

Sold for 11 Keys and 5 Refined(Rounding to 11, credits to aaroncsn for finding the sale!)

http://backpack.tf/profiles/76561198149313875?time=1439017200 (August 8th)

http://backpack.tf/profiles/76561198149313875?time=1439794800 (August 17th)

Gifted Kill-a-Watt Janissary Ketche mini suggestion

Sold for a Nuts & Bolts Salty Dog(11 Keys with Overpay)

http://backpack.tf/profiles/76561198113085336?time=1437116400 (July 17th)

http://backpack.tf/profiles/76561198113085336?time=1437202800 (July 18th)

Using 11.

Sales seem to fit, 9-11 Keys should be fine.

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