I'd talk to amazon about that.
There is generally a warning about things that disappear these days.
If you had THAT much disappear recently, I'd imagine it may have been when they switched formats (for their old format to using more of the ebook format now, which I actually appreciate because I can buy books online from other stores and then download them to my Kindle as I wish much more easily. Project Gutenberg books are easy to put onto the kindle).
In regards to the topic question, I suppose it depends. For games, I only buy games that have offline installers (which means, I don't use STEAM and it's default DRM, which is steam...some have even MORE DRM than that). I store them on a backup hard drive. Does that mean I have physical media or digital media?
For books I use a Kindle these days. I still have a huge library with physical books, but most of my reading is via Kindle these days. It's just easier to carry around with a bunch of books on it. They are all stored on the Kindle though, so is that physical or digital media?
All my music is off of Itunes these days. They are downloaded to various apple items though, and those things are physical. Is that physical or digital?
I can't read RPG books off a computer though. I need to be able to flip through them as I wont. RPG books that I actually USE, those are all physical media.
I also refuse to play those boardgames which require you to use a tablet or phone to play. My boardgames are ALL physical media.
Movies are MOSTLY physical media still. I have at times rented or bought a movie because I didn't want to take the trouble to try to hunt down a physical copy (normally it's a movie I haven't seen before and so I'm not sure I WANT to have a physical copy, if I REALLY like it, I can always try to hunt down a physical copy later) and thus would have it digitally (if bought that's a digital copy I own supposedly).