Ok, a few pages back, I posted pics of my chipmunk chicks that came out of a (supposedly) pure BCM pen from (supposedly) Davis line chickens. I hatched them out myself from hatching eggs I bought from a local man, so I did see that they hatched out of very dark (I would say 7) eggs.
Maybe the hens the eggs came from were purebred Marans, but are you sure he had Marans roosters with them? It's possible he's not separating his chickens- they might all be running together.
When you bought the eggs, did you see his setup? Did he have breeds separated?
It's also possible that he had them running together, then separated them but started saving eggs too soon after putting the correct hens and roosters together.
