It's time that this unusual gets a bump. Many people have been selling for 12 or even 11 without selling within a day which means it's not a quicksell. I suggest 11-12 keys because people are selling within that range and I rarely see any higher offers.

Unsolds:

http://www.tf2outpost.com/trade/18476569 14 keys - 2 weeks

http://www.tf2outpost.com/trade/18738538 14 keys - 4 days

http://www.tf2outpost.com/trade/18264084 14 keys - 3 weeks

http://www.tf2outpost.com/trade/17662568 12 keys - 1 month

Sold:

http://www.tf2outpost.com/trade/18474119 - 11 keys (Roughly 2 weeks ago)

http://www.tf2outpost.com/trade/18360903 - 12 keys (Roughly 3 weeks ago)

http://www.tf2outpost.com/trade/18550616 - 9 keys + purple g.ballonicorn (~11.5) (4 days ago), Also got offered 11 keys but that one didn't go through.

http://www.tf2outpost.com/trade/18181166 - 12 keys (Roughly one month ago)

http://www.tf2outpost.com/trade/18033000 - 12 keys (Roughly one month ago)

Offers:

http://www.tf2outpost.com/trade/17662568

BMOC, high five and a key (~12)

Black Voodo Juju (~14)

Ts bills, purple essential accessories (~10.5)

11 keys

NNB Gym rat (~9.9 with overpay calculation), says he can do a couple of keys in items, probably 2-3.

http://www.tf2outpost.com/trade/18476569

11 keys

http://www.tf2outpost.com/trade/17650949

B\O 12, said in next trade that he could do 11.

There has not been any more sales within 3+ months.

This is my 2:nd suggestion so any feedback are welcome