I agree with Kelly. With an IR4 visa, even since the Child Citizenship Act, the child is NOT a citizen. They are a legal resident and readoption (or whatever the process is in your state) is required to establish citizenship. At that point you need to apply for a COC as proof of that citizenship. A passport is not a definitive proof of citizenship in all cases and is issued by the State Dept. (as you know) not USCIS, which is in charge of citizenship status.
As far as the
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'or some document as follows "a statement from a competent authority (such as a court or state agency that oversees international adoptions) certifying that the child's state of residence does not allow re-adoption'
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- to use my state as an example . . . Michigan does not have any provision for readoption. So in the case of an IR4 visa you can provide documentation as such when filing the N600 for a COC.
I am not by any means an expert but if they came to the US on IR4 visas and have Permanant Resident cards, I do not believe they are citizens and you will need to readopt (or whatever the process is in your state/county) to establish citizenship.
Good luck!