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This really makes me wonder what kind of vet your "Dr. Dan" is supposed to be, as a real veterinarian that "keeps more than a hundred chickens himself" would know that this is not the case. Nice try @CityFarmerRob and at least somewhat entertaining. ;)

Take a close look at your own pictures and you will notice that the broken egg (picture) has a different shell colour and texture than the one you are holding in your hand. Someone is definitely pranking you hard. No need to spend on a vet visit or examination in more detail.

The egg might have already been there under the bedding when you put the cockerel in. Candle the egg or put it in a glass full of water to see how fresh it really is.