Thanks for the confirmation, guys. Disappointing, but not all that surprising. Now the question is do we let them make some chicks, or do I just make dinner :)
The two black and silver ones are the birds in question, the one on the left is the one I am suspecting cockerel because of the more pronounced contrasting white and black below the hackles, plus the much redder comb and wattles. The one on the right I believe to be the pullet. They are the same...