I came accross this chip and was wondering if someone could help me out. In the Official U.S casino chip guide it says the following" all the 4th issues were buried and burned in the desert. Many of the coin centers exist and are confused by non-collectors as valuable coins". In the Chip Rack it does not say anything. A little help would be appreciated. I am confussed. It sounds like there should be no chips available but there are. The chip number in the chip rack is n1685.