Sellers:

http://www.tf2outpost.com/trade/27378708 - 9 Keys (Black Paint) - 15 Days

http://www.tf2outpost.com/trade/27379422 - 9 Keys - 15 Days

http://www.tf2outpost.com/trade/27427523 - 9 Keys - 7 Days

http://www.tf2outpost.com/trade/27455246 - 8 Keys 5 Ref - 2 Days

Classifieds:

http://i.imgur.com/QAkSOaf.png

x1 8 Keys

x1 8 Keys 5 Ref

x1 9 Keys

Conclusion:

Can't sell at 9 Keys and an unsold at 8 Keys 5 Ref. As there is a seller at 8 Keys on the classifieds unsold for 3 Days, taking a range of 8 Keys flat. SCM supports a bigger drop with sales/sellers at ~$15-$16 so the single classifieds seller should be fine.