You're welcome. The wannabe Oswald legal defense team will object to those two fragments from being admitted into court as evidence.
When I first read this, I thought you were being facetious but the more I thought about this, I wonder if that could have been a real problem. By allowing the Navy corpsman to assist in the search of the limo, it could be argued that the Secret Service had failed to secure the crime scene, and the limo was a crime scene. That could make any evidence collected from the limo inadmissible. Since the fragmented bullet was from the kill shot to the head, without those fragments being admitted, it could be problematic proving Oswald had caused the death of JFK. Henry Wade could have still prosecuted Oswald for Tippit's murder and that too was a capital crime, but it might not have been possible to convict Oswald for JFK's murder.
This might seem a bit farfetched but keep in mind this was before the Warren Court greatly expanding the exclusionary rule which allowed defense attorneys to get incriminating evidence dismissed on very technical grounds. I can't remember the exact case but I seem to remember a case where the police department had seized a car and taken it to a private garage to be searched for evidence. It turned out the city's contract with the private garage had expired so technically the car was no longer in possession of the police department and therefore all the evidence taken from the car was ruled inadmissible.
If there are any lawyers among our readers, I wonder if they could weigh in on this issue.