I think we have a lot of outtakes from his movies.
We have the complete Spinout-Session, nearly the complete G.I. Blues-Session, we have 3 CDs with outtakes from Blue Hawaii. We have some FTD-CDs.
Until now Ernst hasn't found any outtakes of Jailhouse Rock, maybe they are erase. There are no outtakes found of Kissin' Cousins.
It's hard to say what exists in the vaults. Maybe we know more after the release of the new Tunzi-Book.