The car was crushed shortly afterwards otherwise a simple reconstruction would have proved the ‘magic bullet‘ theory to be bolleaux.
It was extensively upgraded & modded then put back into service until the mid-70's.
Plated, hand built mill for 20% more power etc.
Not surprising given it cost $200K back in the day...which equates to circa $1.7 millions today.
It was impounded for a bit for (cough) evidence but was quickly valeted to remove JFK's bits & gore.