I'm not too worried about the range for year of birth-the authorities are so often wrong when they find skeletal remains. If they say that the UID has to be at least 17, and the earliest birthdate can be 1961, that gets us to 1978-close to Sylvia's year of disappearance. So I don't think they can be sure for remains that can possibly be that old, unless the building being demolished isn't older than 1978. Having said that, I don't believe this will end up being identified as Sylvia, because I still think she's on Staten Island, or no farther away than Hart Island.