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What I would do:
Call McMurray, explain the situation, then ask them what could be done. I would try to get ALL of my money back since you don't know if the others are carrying the same genetic code. I don't think I would cull any of them, but I definitely would not breed them. I would definitely be freaked out if I got one with a deformity that was so obvious. That is a fully-formed third leg, for goodness sake!
The one that is all black is probably your surprise chick. McMurray sends a surprise mystery chick with your order.