I couldn't follow that part of the document, but it sounded like he accessed the email account of his roommate (or someone else). That can be held to be illegal. In fact, if they can claim a $5,000 damage amount, it's a federal crime.

As for MAC address, they can be changed. Mine's been DE:AD:BE:EF:CA:FE for years. Not that I think the kid sounds like he'd bother to do that. He could easily swap NICs though.