I wouldn't rule out anything BriaN. If a player "walked" with a few chips in 1978, that too is a possibility. However, I'm told that the window of opportunity for obtaining these chips was only for a few short days. It's just that well after over 20 years, one would think that this chip would have surfaced before now if there were any quantity of them around .... or at least a photocopy of one would have been submitted for publication in the "unofficial" guide.

Care to place an estimate of value?