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while I agree with this 100% there is another possibility, all of the domestic mutations came from the genes of pure birds and there is always the possibility that this is just an unusual combination of genes that occurred naturally. I am inclined to believe that it is an error and either eggs mixed up from different pens or a mating by two birds of different color varieties ended up in your batch of eggs, it could always be a color variety that just happened.
Also, there are still imports of birds coming in, many are to breeding facilities that will eventually get the genes out to private breeders but this is getting harder and harder to do unless you belong to some sort of public facility. I have raised exotic animals all of my life, mostly mammals and reptiles, but I have a pair of grey jungle fowl that are F1's, all 4 parents were wild caught birds. I also have lines from very good stock of greys and a pair of greens that are pedigree and their blood line can be traced back to wild imports.