The Crystal Days box contains 3 previously unreleased tracks recorded during the time their drummer Pete DeFreitas went AWOL. The liner notes state: "With/DAVID PALMER or STEPHEN MORRIS: drums".
No recording date is indicated but would have been around June/July of 1986.
The playing/programming certainly sounds like it could be Stephen's work but David Palmer is capable of performing in this style as well.
I think it's odd that the drummer wasn't documented but this could be a result of the two playing on a different combination of songs.
Any thoughts?