The demand for these is dying. Trades selling them for 7 keys are not getting any responses. Not difficult to come by a 6 key sale and even that doesn't get much interest.

5 keys

http://www.tf2outpost.com/trade/8400042 (Sold)

6 keys

http://www.tf2outpost.com/trade/8406955 (18 hours. Unsold)

http://www.tf2outpost.com/trade/8310257 (4 days. Unsold)

http://tf2tp.com/trade.php?trade=9102347 (TS paint. Sold?)

http://tf2tp.com/trade.php?trade=9101846 (4 hours. Unsold?)

http://tf2tp.com/trade.php?trade=9085797 (Sold?)

+6 keys

http://www.tf2outpost.com/trade/8413332 (6 keys & 1 ref. 8 hours. Unsold)

http://tf2tp.com/trade.php?trade=9100417 (BaF paint. 6 keys & 1.66 ref. Sold?)

http://tf2tp.com/trade.php?trade=9104330 (6 keys & 2 ref. 30 mins Unsold?)

http://www.tf2outpost.com/trade/8408446 (6 keys & 2 ref. 16 hours. Unsold)

http://www.tf2outpost.com/trade/8420206 (6 keys & 2 ref. 1 hour. Unsold)

http://www.tf2outpost.com/trade/8384788 (7 keys. 1 day. Unsold)

http://www.tf2outpost.com/trade/8259206 (7 keys. 1 week. Unsold)

http://www.tf2outpost.com/trade/8407128 (7 keys. 18 hours. Unsold)

http://www.tf2outpost.com/trade/8335485 (7 keys. 3 days. Unsold)

http://www.tf2outpost.com/trade/8406012 (7 keys. 19 hours. Unsold)

http://www.tf2outpost.com/trade/8397241 (Orange paint. 7 keys. 1 day. Unsold)

Others

http://www.tf2outpost.com/trade/8384686 (1 day. No offers at all)

http://www.tf2outpost.com/trade/8414513 (6 hours. No offers at all)