I think there's probably wild chickens out there, lemme do a google search and see. BUT.. Even if that were the truth, then the next best moral step would be to keep them in animal preserves or like pets the way people care for dogs and cats.
Yup. Feral chickens are doing just fine and will not go extinct, they have been proven to survive being in the nature without our help.
RE: The eggs you buy at the store, differences in cage-free, free range and pastured