Have quite a few with the cardboard slipcase, a couple off the top of my head Thriller and Abraxas. I think original DVD-AUDIO releases in the CD case before the larger ones should be more valuable also. Maybe in later years they will be, I've got 4 of the original DVD-AUDIO CD case releases.For the Sony titles that were released with a cardboard slipcase, my opinion is that the cardboard slipcase adds value to the SACD. After all, that cardboard slipcase is unique to that title and format as opposed to the generic plastic slipcase. Kind of like an antique toy having its original box.
Edit: Standard Jewel Boxes !
Brain Salad Surgery..