Current Listings:

http://www.tf2outpost.com/trade/8511203

Offers:

-12 keys

-Nutz Madame Dixie (12) + 3 keys = 14 keys

http://www.tf2outpost.com/trade/10891562

Offers:

-Big Kill (13-14) = 12-13 keys

-Logo Pugilist (11-13) = 10-12 keys

Sales:

http://www.tf2outpost.com/trade/11945770

-Sold for 13 keys

http://www.tf2outpost.com/trade/11587308

-Sold for 15 keys?

http://www.tf2outpost.com/trade/11840676

-Sold for 13 keys?

http://www.tf2outpost.com/trade/10497938

-Sold for 16 keys?

Conclusion:

-These people are all awful at recording sales.

-There have been offers ranging from at least 12, my suggested low range, to 14, the current high range.

-Bumping up the high end is hard without and proof of sales, but there have been offers up to 14 so leaving it in the range is still valid.