http://backpack.tf/classifieds/search/id/528305b44dd7b81f2c8b4567

1 at 10, 1 at 23 [!!???!??!]

Much, much rarer than any of the other new s. miscs.

http://www.tf2outpost.com/trade/15714335 - Sold for 6 (outlier)

http://bazaar.tf/trade/536140 - Offered 2 keys

http://www.tf2outpost.com/trade/15706564 - Selling for 5

http://www.tf2outpost.com/trade/15730875 - Selling for 4 keys, offered a lvl v. CnD (meh, either way, prices are way off, but I did sell one for 6 keys some time ago)

http://www.tf2outpost.com/trade/15720494 - Not sold at 5.5

http://www.tf2outpost.com/trade/15720273 - Sold for 4 keys

I'm not really sure, 6 keys might be an outlier given that 5.5 doesn't sell, but 5 is rather young, I might keep it in the range