Files is a liar. His shells were discovered in 1987, manufactured in 1971. Unless Files is a time traveler who took shells from 1971 back to 1963, he's full of Helicopter
. And the shooters were in the pergola, neither of which are James Files. If he had any knowledge of the incident, other than what he read in a book, he would have known where the real shooters were. He's nothing but a con man. The FBI didn't even take him seriously or he'd still be in jail. There's no statute of limitation on murder, and if you're dumb enough to confess to a murder, you'll be going to jail. These things aren't rocket science.
First, let's see your proof. Second, why would conman Files plant a hull from the wrong time? Third, you assume that Files knew the planted hull was a hoax, which you don't. Fourth, how did Files know JFK was struck by a frangible bullet a split second after a bullet struck him from the front causing his head to move back and to the left?
It's not just about the spent hull with his bite mark, which I will reserve judgement on until you post your analysis disqualifying it. Files knew details re the Turkey Shoot, which IMO were borne out many years later. Otherwise, bragging rights aside, I don't see what was in it for him other than a book deal, which never materialized. This case can never be resolved while the conspiracy deniers keep sweeping all potential evidence under the rug in a rush to judgement.