Can't see there being a government conspiracy on that one. There were sensitive government offices in Building 7. As soon as the first plane hit, those offices were 100% secured and evenyone in them was 100% evacuated. (post-OKC bombing, those offices lock & leave when personnel are considered to be in danger)
If there had been a government conspiracy, I'd think those offices would have had a way to move information and sensitve documents out before everything went pear-shaped instead of representatives from those offices having to spend months at the WTC site trying to seperate out anything that looked like it might have come from their offices for special and thorough disposal.