I think that risk would be very minimal, if any at all. The parent birds may be carriers of some illnesses and there may even be bacteria in the eggs, but I don't think it would have any bearing on your flock as people do this ALL the time. I mean it...breeders buy eggs from other breeders, people buy eggs from random strangers on Craigslist, etc. I've not heard any cautionary tales about doing it.