New testimony about why Sandy Berger's private destruction of public documents attracted such curiosity at the time. Bottom line is that the guy took significant personal risks to destroy evidence. (Counter to the press report there, it was the handwritten comments on each of those copies which held the unique value, the reason for the theft, destruction, and dishonesty.)
Any reasonable thinking person can assume from this that the Clinton machine knows that it would be nuked were the record known, and that it leveraged Berger into personal destruction to destroy the public record. Nothing else I've considered makes a tenth the sense.
It's also clear that the Clinton machine has dirt on the Bush organization and related groups, or else they'd break out stuff like Jamie Gorelick's strange placement on the 9/11 commission, the impossibility of Vincent Foster shooting his head in Ft. Marcy Park, and the rest.
We may not know directly what happened, but it's easy to see the indirect effects, and know where the juice flows.