Nobody has explained why a find of this historic magnitude is entirely undocumented. That is highly suspicious, particular if big-time collectors were involved. Where are the photos of the dig? Where are the photos of the piles of the marbles, the cleaning and sorting? This is a hobby where members savor history, particularly documented history. There is no shortage of photos of every bit of packaging and paper and marble history, except in this case.
Clearly somebody has something to hide, but it is not clear what that something is.
My gut tells me that if these are genuine vintage CACs, then somebody got them for a song from somebody who did not know their value, and that explains the hush-hush nature of their origins.