Zeb... The 3 non-denominational chips were introduced into The Chip Rack in 1999. These chips began appearing at that time and it is my guess that the people who found them made an argument that the authors at the time found compelling enough to warrant inclusion in the book, even with the "attributed to..." qualification. Recently, though, it was discovered that these chips were used in a Sacramento, CA casino, and while no manufacturing records are available, we are relying on this positive attribution, rather than what was ostensibly guesswork that get them included in the first place.
The fact is that people WANT unidentified chips to be from Nevada because that makes them more "valuable". There was some traffic of chips between California and Nevada in those days so it doesn't take much of an imagination to say that because there was a 49er Club in Lake Tahoe and the chips might have been found somewhere in Northern Nevada that they were used there. The evidence, though, just doesn't support this in this case, and since, again, we have no records to verify this, it becomes too much of a leap of faith to continue to include them in The Chip Rack.
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