Someone needs to sit down and calculate how long it would take to read 30,000 emails and determine if they were all personal or business related. And then delete them. Have gone though a few hundred myself and it is no easy chore. At the very least an honest ethical person would have sent them to an archival folder just in case a few mistakes were made in the review and deletion process.
Giving the emails in paper form also avoids the routing and traffic details... Surely, the path by which the emails traveled would present potential breach points.
Just sayin’