Well, if you have something that is Securely under Lock-N-Key, what's the hurry? This could even be regarded as a "work in progress". As technology advances, so too then the work project advances. This destroys the argument that 1963 technology limited what could be done to the Z Film.
HUH?? A work in progress on what was supposed to be original, unaltered, evidence??
Perhaps I didn't make myself clear...As the technicians worked on "the work in progress" perhaps some of their work disappeared ( a few critical frames) Someone grabbed a souvenier, or something to use as blackmail, or evidence to be produced in court. Hoover would have known that he would never be able to display their dirty work because the frames missing could expose the whole big lie. Thus he locked the Z film away from public view.
