Journalists can’t be prosecuted for publishing stolen material unless they were part of the theft. And the theft in question hardly seems to rise to a federal crime.
And shield laws normally mean law enforcement can’t make reporters reveal a thing about their sources, even if they didn’t publish anything.
Journalists regularly publish material that has been leaked or even taken — consider the Times running President Donald Trump’s tax returns. Unless the feds know something about Veritas sanctioning the burglary, the diary does not warrant pre-dawn raids. It has all the marks of a political vendetta.