Reposted, I accidentally used the wrong currency in the last one.

It was impossible to sell mine for 6 keys and it was painted pink. I ended up selling it foor about 5.5- 6 keys in items.

http://www.tf2outpost.com/trade/9672441

I did a little research and this is what I found.

No luck at 6 keys or lower

http://www.tf2outpost.com/trade/9846438 - Black paint for 8

http://www.tf2outpost.com/trade/9874659

http://www.tf2outpost.com/trade/9803260 - trade closed but still belongs to him

http://www.tf2outpost.com/trade/9895934

http://www.tf2outpost.com/trade/9906360

http://www.tf2outpost.com/trade/9777014 - white paint for 7

http://www.tf2outpost.com/trade/9896847 - white paint for 7

http://www.tf2outpost.com/trade/9645434

http://www.tf2outpost.com/trade/9843216

http://www.tf2outpost.com/trade/9468315 - black paint for 8 or less

http://www.tf2outpost.com/trade/9662148 - white paint for 7.75

http://www.tf2outpost.com/trade/9816839 - white paint for 8

http://www.tf2outpost.com/trade/9889817 - white paint for 7

http://www.tf2outpost.com/trade/9888227 - lime paint for 7

Successful buy at under 5 keys (either has in their inv or comments on trade)

http://www.tf2outpost.com/trade/6483270

http://www.tf2outpost.com/trade/4881989

http://www.tf2outpost.com/trade/9008942

http://www.tf2outpost.com/trade/9028333 - has offers of about 5 keys

http://www.tf2outpost.com/trade/9527914

http://www.tf2outpost.com/trade/8705076

Other proofs but they are a bit old:

http://www.tf2outpost.com/trade/9021344

http://www.tf2outpost.com/trade/9193177

Buyers get very few for their “reduced prices” but some still manage. There are still a lot of offers for 5 keys on these peoples trades however. On the other end of the spectrum, 6 keys are definitely not happening either. 5- 5.5 keys seems like what the going price for this is now.