Why is the mouse eating the cabinet shelves only
I asked my cat about this and she says she knows how mice operate and doesn't even need to see pictures of the damaged cabinets.
She says no doubt the mouse is entering the cabinet in a shelf that has no food on it, and is trying to chew his way from that shelf to another, where the stuffing, bread crumbs, etc. are stored.
If you leave the cabinet doors open overnight, the mouse will leave your shelves alone and confine his depredations to more traditional fare.
Of course, cats are supremely arrogant and often present mere guesses as qualified opinion, so she could be wrong.