If you are suspicious as to their claim, you can always report them to Authenti Seal. Check their Wall of Shame for phonies posing as SEALs. It's amazing how many losers there really are out there trying to pretend they are SEALs.
I saw a report on TV where this silly lady on the internet met this nut who claimed he was a SEAL. She looked him up on that site and found out he was NOT a SEAL. BWAHAHA, busted!