Yes they may well be other gold/diamond ones known elsewhere but still no concrete proof of a Playboy one (yet) other than rumours.
Considering they were happy to show off the gold Clermont one and all gaming items had to be known by the gaming board, doubtful but hey..............Plus, there would be some members of staff that should remember as they would have had to use them.
I know Tom was good at researching but Playboy plaques do still exist and as far as anybody knows that I have spoken to, Playboy Clermont gaming items don't. Both of those statements are contrary to what Tom thought/wrote (so far) although I'm happy to be shown otherwise.
I would have thought that any of the highest denominations would have only been used in the VIP casino and not the "ordinary" ones as that is what VIP gaming floors are for.
Time will indeed tell but speculation just adds fuel to the fire if no actual substance to it.
I hope we manage to find out for sure and have tried my hardest to confirm or not. Maybe one day we will but I'd rather deal with what we know not what we don't.