What I find really curious is why noone left the archive building to retrieve the documents stashed at the trailer. One of the links I read gives a pretty detailed account of Mr. Berger's actions as he approached the trailer. Could it be he was caught on a security camera which was only found after an investigation was started?
I would bet he still has the original/copies of the documents as an insurance policy. A serious prosecution with severe penalties should have shaken those documents back out of his pants. Too many things just don't add up in this whole case.