Unfortunately, I'm glad to read about this. I am trying to buy tickets from a season ticket holder on Craig'slist Boston- and I thought he was trying to scam us! We're coming from Austin, Texas- so really can't verify in person- any suggestions on not being 'taken'?
If you are buying a ticket from texas, you might not want the actual ticket. You might want the ticket directly emailed from their account. All season ticket holders can forward the ticket from their account. Or maybe you should ask for both.
The advantage is that if they email the ticket from their account, they no longer have access to that ticket. If they email you a ticket, they can still forward the digital ticket, which would invalidate the printed ticket. Even if the person wasn't dishonest, they could forget they sold the game and use the digital ticket.
If you are worried about a scam, that seems the safest. Unless, of course, they fake the email and can fake the header info, as well as print fake tickets!
Also, regular season tickets aren't yet available online either. Only the preseason are available in the season ticket holders' accounts, so there is nothing to be sent yet.