Catalina, she is a beautiful bird, but I can assure you that MPC has EEs. Another hatchery misrepresenting their stock to entice buyers to make the purchase.
I will add to speckledhens analysis of Ameraucana by stating the green legs are typically a sure sign of mixed breeds. Generally Ameraucana breeders don't throw green (or yellow) legs unless their working on genetic structure for something else and crossing the birds. In that case, a good breeder would inform you of the defect and why they are culling this bird in order to educate you on what to expect of your bird and what the correct standard should be.
The typical defects on a true Ameraucana are plumage color, which seems to be the biggest challenge in most breeds. I have true Ameraucana in my EE pen because their plumage color is wrong for the Ameraucana breed. Because they are crossed in an EE pen, the offspring are all considered EEs to me. To give you an example, my black ameraucana has some specks of red in her neck..not acceptable by my standards to use in a black ameraucana breeding pen as the offspring have the potential to display this trait. She works fine as an EE because there is no feather color pattern guarantee on them, plus her blue egg gene is added to the EE gene pool.
I also raise bantam buff ameraucana, which the offspring throw the correct traits all of the time. This is how pure breeds should work. An occasional toss of green, white or yellow legs should not happen if you are breeding true.
Jody