Honestly, beside falling in price the range is still the same.

Sold for an Australium Black Box(16 Keys with Overpay at the time)

http://backpack.tf/profiles/76561198072573105?time=1437980400 (July 27th)

http://backpack.tf/profiles/76561198072573105?time=1438066800 (July 28th)

Sold for a Kill-a-Watt Ol' Snaggletooth(11 Keys with Overpay)

http://backpack.tf/profiles/76561198087083646?time=1441868400 (September 10th)

http://backpack.tf/profiles/76561198087083646?time=1442041200 (September 12th)

Two sales, 11-16 Keys should be fine.

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