One example being there are tables with 12-13 colors where no more than 8 colors ever left the vault and, in that same house one table was never open.

There is also delivered inventory which gaming pulled and either returned to manufacturer (if accepted) or under concrete and not destroyed.

...and, of course; there is production that never left the shop (as was the case at USPC).

Mystery still unsolved here and no longer available at this fime (or, as Eisenstadt used to say... "for now").

In the case of your question, if chips were in play, they are able to walk and find their way into a collection, somewhere.