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Based on what I've seen people shouldn't be selling less than 9 keys at the moment (unless you're desperate for keys). They can sell at 10.
http://www.tf2outpost.com/trade/5975960 (9 keys)
http://www.tf2outpost.com/trade/4682131 (originally around 11, but got tired and dropped it to 8 I think)
http://www.tf2outpost.com/trade/5732684 (seems to have sold 4 at 10 keys over the course of 6 days)
Here's another that's just been posted with a 10 key buyout price
http://www.tf2outpost.com/trade/6001009
And a few other older ones
http://www.tf2outpost.com/trade/5154707 (offered 5 keys + 15 ref = about 10+ keys, 1 day ago)
http://www.tf2outpost.com/trade/5022838 (sold for 10 keys, but 2 days ago, http://www.tf2outpost.com/backpack/117746)
http://www.tf2outpost.com/trade/5919199 (unsold at 10 keys, not sure how long he's been offering it at that price, at least 2 hours, anyway)
http://www.tf2outpost.com/trade/5917835 (unsold at 10 keys, though he's been offline for 14 hours)