Guess what? When you produce the microfilm, you will then be able to say that it is in itself the evidence proving it exists. Not that complicated, a reasonable person will not roll over just because you tried to answer a question with a question.
You said there was microfilm
I said "Where is it?
Your answer --well, you did not have an answer instead you pick a game of tennis by saying "where's the evidence that it is missing?"
My answer to that question is I did not claim it exists or does not exist. I sure am not going to take your word for it, you yourself don't even know if it does or not.
BTW This is exactly why you are unable to make a point and if you ask "were they lying too?" I don't know who is lying but they sure fooled you