None on Outpost or Classifieds.

Sold for 4 Keys

http://www.tf2outpost.com/trade/23452535

http://www.tf2outpost.com/trade/23389192

Bought for 4 Keys(the ones I have right now and that I don't intend to sell) and Sold for 5 Keys

http://i.imgur.com/C7x3bbB.png

I should note that my Bootleggers were not listed for sale, someone offered me 5 Keys for them and I took it.

Considering there are no current sellers and that I didn't even try to sell mine for 5 Keys(And also SCM sales going well over 4 Keys, but that doesn't really count) a range of 4-5 Keys might be needed.

For reference: http://steamcommunity.com/market/listings/440/Collector%27s%20Bootlegger

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.