Unsolds:

Unsold @ 12 Keys - http://www.tf2outpost.com/trade/23248680 (Clearly not a quicksell. It's Oct. 20th and no offers. It even has TS paint.)

Unsold @ 13 Keys - http://www.tf2outpost.com/trade/23277910 ( From October 22nd, no offers. )

Unsold @ 13 Keys - http://www.tf2outpost.com/trade/23303643 ( Fairly new, someone offered 8 Keys pure. )

Unsold @ 15 Keys - http://www.tf2outpost.com/trade/23101669 ( Stale trade, October 11th. Was offered 6 Keys + some hats, there was talk of a Bubbling Pot + a White bills, but trade never occured. He redacted the offer. )

Unsold @ 15 Keys - http://www.tf2outpost.com/trade/23022165 ( Very old, October 6th. Was offered 10 Keys + 3 Ref, and a Steaming Robo Glove + 4 Keys. )

Unsold for 1 bud - http://www.tf2outpost.com/trade/23203009 ( October 19th, was offered 10 keys. )

Solds:

Before: http://backpack.tf/profiles/76561198071507394?time=1414059572

After: http://backpack.tf/profiles/76561198071507394?time=1414134000

Handyman + 6 Ref for Terrorwatt Mongolian

Was relisted at 13.

Before: http://backpack.tf/profiles/76561198033033959?time=1408518000

After: http://backpack.tf/profiles/76561198033033959?time=1408604400

Sold for Bills, 7 Keys, 5.66 in items

So roughly 12 Keys.