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Just bought them for 3.5 keys.
http://www.tf2outpost.com/trade/15273308 -> http://puu.sh/50tmq.png
Extremely rare on Outpost.
The only other seller of these:
http://www.tf2outpost.com/trade/14377269
Offers of 3 keys & 3 keys + Sight for Sore Eyes (~3.5)
Search Link because clicking filters sucks http://www.tf2outpost.com/search/162908861
Not enough proof.
Good luck finding more. Because this is all the proof available.