Mmmm to the left, to the left, everything you own in the box to the left...

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All proof is credited to Draco Blaze, copypasta time.

http://www.tf2outpost.com/trade/21110729 - 3 Ref C/O

http://www.tf2outpost.com/trade/21027981 - 1 Key (Declined? Redacted? No idea.)

http://www.tf2outpost.com/trade/21293224 - 1 Key C/O but no proof of it

http://www.tf2outpost.com/trade/21402018 - Young, No Offers. Wants ~8 ref to a key

http://www.tf2outpost.com/trade/21457592 - 1.66 C/O (He also has one as a "quicksale" for 1 key)

Solds:

http://www.tf2outpost.com/trade/20964512 - 1 Key

http://www.tf2outpost.com/trade/20060044 - 3 refined (Quicksale)

http://www.tf2outpost.com/trade/20715651 - 1.33 Sold

http://www.tf2outpost.com/trade/20163553 - 1 Key

http://i.imgur.com/zwnR8Mt.jpg?1 - 1 Key

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Conclusion: 1 key is the most common sold point, lower prices seem to be a quicksell.