It is illegal for them to have the blackbird eggs and does not matter that they think they are trying to help. There is a sticky in a lot of forums about the Migratory Bird Act and that all posts about the illegal possession of protected birds or their eggs will be locked.I have zero expertise here, but guessing one of you fine folks can help with this:
https://www.backyardchickens.com/th...od-pigeon-eggs-and-2-black-bird-eggs.1384342/