I understand commercial email accounts aren't secure. So I don't treat email as being secure.
Look at what you have here. A pair of half drafted generic position papers. A legal memo about a document review protocol (I carry stuff like that in my unlocked briefcase). And a couple of what appear to be public documents about torture. The most potentially embarrassing thing on there is his SF86. But a quick scan of it doesn't show anything embarrassing on there.
If he was sending actual sensitive information on an insecure email, that is a problem.