Can I do it by mail?
Yes, to do it by mail you first need to remove plates and stickers,
What do I have to do if my plates were destroyed?
You have to report your destroyed plates to the DMV and surrender the registration. The DMV can issue you a new registration and plates.
What else do I need to do after removing the plates?
Remove the plates and the stickers.
My plates were destroyed.
What should I do about it?
I can't surrender my plates.