Yeah, i had an emerald crab, and i thought it died like 5 times. I mean, the "molt" looked like the entire body, with the legs, and eyes and all, i mean, it really did look just as an emerald crab woud if it were dead. But take out the carcass and inspect it, if it is a molt, then dont worry, he will hide well wor days maybe up to a week until his shell hardens... : )