I have never seen any store selling poem , you should buy a new case or not, if you will just give it to you. Do not worry about the aesthetics of the case I think that just drops of glue into the cracks, it should be okay.
I have never seen any store selling only bolt you should buy a new case ? If you will only take it to work. Not serious about the beauty of the case. I think just drops the glue into the cracks, it should be OK.