I must be one of the slowest players ever - as I never seem to make even the smallest dent on my "not yet played" stack and so still have lots of unplayed Adventures !!
I still have lots of unplayed older ones on the shelf.
But the newer ones are all insubstantial "bits-in-the-air" and have no physical presence.
I don't even burn the installation files to DVD any more because they always seem to get updated versions. I hardly ever see patches anymore -- just a whole new humongous download.