Re: Souvenir Tickets
Call the Houston Texans ticket office, explain your situation and ask them if there is way to verify the tickets.
Maybe you can call them and verify the bar code that they are real and are not cancelled. THey will probably tell you to go through the Texans ticket exchange
You can also have the guy email you the ticket through the Texans website, assuming he's the season ticket holder. If he is not, I'd be very wary.