Wow, already screwed up my first suggestion, let's try this again...

It was the only one on outpost, but it had already sold and the trade is still not closed at the time of suggesting (owner told me he'd close it soon). Went unbumped for several days:

http://www.tf2outpost.com/trade/26822412

Sale 1:

Bought for 15 keys pure (image credit to Demonhunter1213):

http://imgur.com/gallery/FU1y6/new

Sale 2:

Bought for 17 keys pure:

http://imgur.com/NRP8bdw,iSkFbNQ#0 (shows the 17 keys)

http://imgur.com/NRP8bdw,iSkFbNQ#1 (shows that it is power surge)

This is technically my first suggestion, so I apologize for any mistakes, constructive criticism and feedback greatly appreciated.