Greg is probably correct and I don't have any information to dispute it. However common sense still tells me that the yellow chips were probably ordered at the same time as the other Paulson chips. The "unknown" chip may hve been used only in the poker room. It would make sense that very few chips would get of the poker room of a casino open only a few months. The guy I got my chips from said that he got them at a $.25 Craps table.