if its not in the Trash folder or in the additional options of "recover deleted items" - they no longer exist. Comcast wont have them either.
like i said, unfortunately unless you made your own personal backup of emails - we wont have them if its not in "recover deleted items". Legal issue or not. Comcast does not store/backup/keep forever customer private emails. If you deleted them and they went through their life cycle in the trash folder - they got purged from our systems.