Needs another drop.

Proof:

Classies:

http://backpack.tf/classifieds/search/id/5206d792ba2536b005000004 (2 at 15, 2 at 16 and 2 at 17)

Outpost:

Unsolds:

17 keys:

http://www.tf2outpost.com/trade/9776018 (Doesn't look to have sold any recently)

http://www.tf2outpost.com/trade/13880381 (6 hours, young)

http://www.tf2outpost.com/trade/13762603 (5 days)

http://www.tf2outpost.com/trade/13307103 (3 weeks)

Selling:

16.5 keys:

http://www.tf2outpost.com/trade/13735143 (Sold 2 within 6 days)

http://www.tf2outpost.com/trade/13884611 (3 hours, young)

16 keys:

http://www.tf2outpost.com/trade/13321051 (3 weeks)

http://www.tf2outpost.com/trade/13545158 (Sold, none in his bp)

http://www.tf2outpost.com/trade/13716507 (Sold)

http://www.tf2outpost.com/trade/13347539 (Something about being unable to trade?)

15 keys:

http://www.tf2outpost.com/trade/13709296 (1 week)

http://www.tf2outpost.com/trade/13395468 (Sold a few within 2 weeks)

http://www.tf2outpost.com/trade/13817848 (Has an add)

http://www.tf2outpost.com/trade/13835589 (2 days)

http://www.tf2outpost.com/trade/13463907 (2 weeks)

http://www.tf2outpost.com/trade/13842177 (2 days)

14 keys:

http://www.tf2outpost.com/trade/12449656

Apologies for lack of unsolds. There aren't many sellers at 17 keys and the sellers that are don't seem to be having much luck. I was going to make the range 15 - 16 keys but there appears to be a few successful sellers at 16.5 keys (16 keys and 3 ref) so I have left that in the range. LOTS of sellers at 15 keys so that is also being added to the range.

Don't ask for more proof. This is not a common item.

Thanks for voting : )