these. The blue one is the 25 center. They used these before the real opening when they really weere in tents. I didn't collect $5 at the time so I don't have any. I know the previous GM told me there were boxes upon boxes of unused chips in the vault many years after opening. I think the new chips were designed after he left. I don't make the trip up there very often, nor does my friend come down to the desert often, but I'll see if I can get up there some day after the weather clears up to see if they will sell me anything.