A lot of small electronic devices have a precision cut piece of clear plastic stuck to their displays. It cracks me up how 2 or 3 times now I have had a device for over a year before I realized. I think the first one was a fancy “indiglo” watch. I accidentally bumped it up against a cement wall and I looked down to see the damage. Happily instead of a big scratch I found a secret plastic film that started to peel up. Kind of like putting on a winter coat and finding money in the pocket that you had forgotten about.