I would say that Feed stores are definitely mislabelled Ameraucana's and are actually EE's. Typically. If you look in the stock tanks and see a varied myriad of colors and chipmunk strips....EE's.
I would venture though that breeders advertising Ameraucana's on Craig's List should know better how to label their birds. But I'm sure that varies person to person on CL. LOL. So there are some color questions you could ask. Black, Lavender? That might tell you if true Ameraucana or not.
I would bet not. They were told that's what they were and they just hatched their eggs.