Tarahumara Mountain Boa lines?

[Malum Argenteum]

To the best of my knowledge, all Tarahumara boas in US herpetoculture descend from the original founders brought into the states of which that founding pair produced a litter of 10 in 1999. A pair from that litter was acquired by Gus Rentfro/Rio Bravo and produced a litter of nine F2 offspring in 2002. All of this according to The Complete/More Complete Boa Constrictor. I’ve seen many listed as Vin Russo line but as far as I know, Vin got his originally through Gus.

Yes, that's the official account. A couple things make me wonder.

For one, that doesn't square with public import records, which don't show that import exactly that way (though there were a couple confiscations of B.c. at that time that were permitted in -- I wonder if those were the ones that went to the researcher at Arizona).

Also, there are breeders offering Taras that are claimed to be Rio Bravo line, and then also legit breeders who state that they're not sure whether at least some of their breeding stock is Rio Bravo line (implying that there are other lines that they cannot or do not want to identify).