In Pennsylvania, the county coroner maintains jurisdiction over the body, and conducts any proceedings relative to identifying cause and manner of death. It's also his duty to notify next of kin.
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PA Laws Empowering, Defining and Limiting the Power of the Coroner
SECTION 1237 -- CORONER'S INVESITGATIONS
(a) The coroner having a view of the body shall investigate the facts and circumstances concerning deaths which appear to have happened within the county, regardless where the cause thereof may have occurred, for the purpose of determining whether or not an autopsy should be conducted or an inquest thereof should be had, in the following cases:
(6) any death wherein the body is unidentified or unclaimed;
(c) As part of this investigation, the coroner shall determine the identity of the deceased and notify the next of kin of the deceased.
SECTION 1238 -- AUTOPSY; INQUEST; RECORDS
(b) If the coroner is unable to determine the cause and manner of death following the autopsy, he may conduct an inquest upon a view of the body, as provided by law. At the inquest, the coroner's duty shall be to ascertain the cause of death, to determine whether any person other than the deceased was criminally responsible therefore by act or neglect, and if so, the identity of the person, and to examine any further evidence and witnesses regarding the cause of death.
http://www.pacoroners.org/Laws.php#1237
I can't imagine any official postponing notification of next of kin once an identity is made. I do recall cases where the family was notified, but the information was withheld from the media for a day or so. This would be the most probably scenario if the suspect was a flight risk, and LE needed time to obtain an arrest warrant and set up surveillance. In cases where the NOK is the suspect, I suppose the coroner might hold off for a short period of time to give LE a head start.
The truth is, the person might have been dead a year or longer. The only thing we know is the remains have to be at least several weeks old.
I agree it's possible the remains are partial. That could be deliberate, or the result of scavengers since the body was found in the woods. Although, animals normally won't drag off a skull. But they were found on Thursday morning, and this article says crews were still on the scene Friday night. They might have been looking for missing remains.
http://www.abc27.com/story/19990948/human-remains-discovered-in-elizabethtown-identity-unknown