http://www.tf2outpost.com/trade/10598534 - B/O : 17 keys

Offers :

Steaming Hard Counter+2keys ~14 keys

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http://www.tf2outpost.com/trade/10500774 - Had a B/O of 18 keys, sold to Gaelik for items(not sure how much)

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Other trades :

http://www.tf2outpost.com/trade/10622300 - B/O : 18 keys

http://www.tf2outpost.com/trade/10522421 - B/O : 19 keys

http://www.tf2outpost.com/trade/10616942 - B/O : 19 keys

http://www.tf2outpost.com/trade/10603403 - B/O : 1 bud

http://www.tf2outpost.com/trade/10420746 - No offers

http://www.tf2outpost.com/trade/10630148 - No offers

http://www.tf2outpost.com/trade/10604566 - No idea

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Last Suggestion 3 months ago .

8 on outpost : http://www.tf2outpost.com/search/106344348

--Sorry but i cant really find more proof, all the other trades have no offers