The movie was released in 1998. That means the chips were probably made in '96 or '97 at the latest. When did the jockey mold become available? I thought it was later than that. They sure do look like JM though.
I asked the film's production designer about the chips. His reply:
It was so long ago...! I seem to remember that my Set Decorator found a chip company that made them for us. Unfortunately she died a couple of years ago and I know that the Film Company won't have kept any records.