Here is your answer(s):

Jim said.........."I saw the oversize chips being used. So have many others. I was often in line making my Monday Night Fever parlay wager watching large wagers being made with those very sport book oversize chips. They were Bud Jones metal centers. I can not and do not remember the colors or inserts. At that time, I had no interest in such matters. However, I will say this I know of no other Castaways oversize sport book chips that have surfaced, since the 1987 closing, except those that are currently in collectors hands".............

I have seen no others except the ones YOU claim Osborne had made. Maybe the real ones got mixed up with the ones Osborne had made. Maybe it will rain tomorrow....Maybe the butler didn't do it....Don't you have anything to do?