The RM has a special screen coating designed to cause friction with the stylus so it sounds scratchy and “feels like paper”. I suspect you could recover what people wrote by analyzing the screen wear.
Obviously that’s a whole lot more work than just downloading unencrypted files, though
If you have physical forensic capabilities I’d guess that there is more that can be covered from the natural ghosting of the screen as well.
It’s been a while since I last messed around with the RM2 internals - it’s nice hardware and ghastly software, but from what I recall the crash collector in there does not seem to be mentioned or covered by their approach.