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There aren't many of these, but here is the proof that there is on the market:
http://www.tf2outpost.com/trade/17408223 (Selling at 8 keys, unsold for a month)
http://www.tf2outpost.com/trade/18144236 (Selling at 10 keys, unsold for 2 days)
http://www.tf2outpost.com/trade/18142883 (Selling at 9 keys, unsold for 2 days)
http://www.tf2outpost.com/trade/17900203 (Wants at least 10 keys, unsold for 1 week)
As I said, there aren't many on the market, but this is all of the proof that I could find.
EDIT: Extra proof: http://backpack.tf/classifieds/search/id/52d6fc854dd7b84b678b4568 (2 unsold for a week at 10 keys)
Don't think you can price a new item based on b/o alone though. Some sold at that range will be needed.
There aren't many actually being sold at the moment though, if I find any proof of solds I'll post it.
It would be best if you closed the trade and resubmitted it later with solds. Look throught the histories of the current items.