You have it backwards. The fact that he doesn't release the metadata is interesting. If he had released the metadata, it would be wholly uninteresting.
I don't think the emails exist. What was published in court records, lacking metadata, could easily be forged. The metadata is harder to forge. Not impossible, but harder, especially long after the fact.
I don't think the emails exist. What was published in court records, lacking metadata, could easily be forged. The metadata is harder to forge. Not impossible, but harder, especially long after the fact.