The Government locked up 10,000 files and pieces of evidence for 75 years (until 2036 now); it isn’t for lack of wanting to know the exact sequence of the assassination as for me.
The debated dictabelt tape analysis has been said to confirm 4 shots.
http://ourworld.cs.com/mikegriffith1/hscaacous.htm
Conspiracists believed that brief moments of silence contained on the Dictabelt were evidence of the individual shots and even went so far to call them 'impulses', thereby creating something out of literally nothing.
Get up to speed here, please: Dictabelt evidence relating to the assassination of John F. Kennedy
Dictabelt has been impeached as evidence of conspiracy, RGPII.