Selling 6 keys

http://www.tf2outpost.com/trade/10323664 -- 3 days

http://www.tf2outpost.com/trade/10383822

http://www.tf2outpost.com/trade/10361059

http://www.tf2outpost.com/trade/10311381 -- 4 days

http://www.tf2outpost.com/trade/10416912 -- 6 keys + Unique replacement (~2ref)

7 keys Unsold

http://www.tf2outpost.com/trade/10384054 -- 1 day (Short)

http://www.tf2outpost.com/trade/9915554 -- 2 weeks

http://www.tf2outpost.com/trade/10353703 -- 2 days

http://www.tf2outpost.com/trade/10151660 -- 1 week

Sold for 7 keys

http://www.tf2outpost.com/trade/10253727 -- Sold one of 4

http://www.tf2outpost.com/trade/10352953

http://backpack.tf/classifieds/search/sharp%20dresser

One for 6 keys for sale in Classifieds (at time of posting)

Proof is a bit smaller than I'd like, but I only had 4 pages of outpost sellers to work with.

Anyway, people are willing to sell at 6 keys, but 7 key sales are still possible (I'm sure I'd have more if closed trades were still searchable)