I don't think it would be that hard to hide it. I don't recall much of any information coming out about the family other then they have been moved. Where to? That the CDC people would hide it is certainly believable to me. This Admin and their people are not truth tellers.
Do a search. Duncan has relatives crawling out of woodwork. Several nephews, more sons, a mother, a sister and her family, a brother, etc. in the US. He was probably the last of the tribe to come here.