I have the same version, Drew. Great song!
The unreleased song in Mixtape was Whiskey Wings. I would not expect to be able to download it any time soon, or at all as it may never be available for sale. Whiskey Wings is an older song that Eric wrote many years ago. It was released off of Dean Miller's (son of Roger Miller) 2005 album Platinum. I, personally, had downloaded that copy for my collection from iTunes.