My understanding of the promotion was if you hit a jackpot you could pick one of the four tokens. You had to hit four jackpots to get the entire set. Most people picked the 2000 Millenium token first because it was the only one with something to do with the Y2K thing that was going on at the time. After the promotion ended they had a lot of the other three left over. (maybe the Riviera doesn't give many jackpots) Most of them were sold to one of our nice dealers and he sold them as a set of three for 45 dollors at the convention. So now the chase is on for the rest of us to find the "forth" one. To see someone selling the set of four is rare. Great find.