Andrew,
I've had private conversations with Robert and Russ, regarding these snakes. I don't pretend to be an expert on these locales, but my first impression when the photos of mother and offspring were posted, was "Wow, there's Xmas in those." Based on comments by Robert, and comments on the forum, both Buzz and Spano were working with both locales at the time.
I don't think the question is whether the dark mother caught by Spano (and apparently used in the breeding of your clutch) is authentic, but who exactly was the father?
I can imagine a scenario where an Xmas male is accidentally coupled with the Spano Limpia. Because the female is so dark, it could be mistaken for an Xmas animal at the time of the breeding.
"Apart from the fact that it turned black, do you see Limpia characteristics? It may not be typical, but I've never seen an Xmas snake that started out that dark. Some Xmas snakes may mature to be black with neon orange, but they don't look anything like that as neonates..." Yes, you can see the LImpia characteristics, unfortunately the Xmas characteristics are also there. You are referencing the results of an Xmas pairing. Now, if you take a Limpia female, and an Xmas male...
Of course, all of this is speculation. I will stop short of saying there is no way these can be Limpia animals, but I will say that if this isn't a lesson for anyone who is breeding/buying locality animals, I don't know what is.
If you are breeding locality animals, photograph the pair, and the actual coupling, if possible. Photograph the offspring. Document who received the offspring. If you intend to use animals you did not collect, verify detailed collection information from the original collector. If you can't do this, do not use the animal.
If you are purchasing a cb locality animal, demand this info, all the way back to wc!
Imagine the confusion you could avoid, lol!
John