Hmmm, interesting because mine has the blue and yellow plates. Although you always had an option in CA to get new plates if desired, so that could be the case here. Also, I know this car was in a collision at one time, so they could have been crunched and received new plates after it was put back together.
Otherwise the info I got from that last owner was bogus. )-:
Maybe I'll do title history search to see what I can find.