"the gaming control board requires that all chips collected go back to their original manufacturer i.e. paulson/bud jones etc. to be destroyed."

No such regulation.

Most casinos do not release the number of chips destroyed. No paticular reason not to. If someone were to ask the right person, they might give you a copy of the destruction letter. I have several from different casinos.
Look in TCR for the Fiesta. Numbers for the rack we destroyed are there.