You could rename them (do something like put a "zz" in front of the filename) and then wait a few days to see whether something goes wrong. You could move them to another folder, but I always find it easier to find those "let's see what happens" files if I give them a name that sorts them to the bottom of any list, or to the top ("_" works well for that).
If nothing bad happens or the machine doesn't seem weird, delete them.