There's a similar thread going on at Fred Miranda. The one I saw can be searched using the word "promo".
It looks as though the thread is indicating that
B&H is insuring that buyers did indeed attend the 'show' related to the promo code. Don't know if the promo codes have anything to do with the flyers their people were passing out throughout the PPA show here in SA. I threw mine away some weeks ago as I was in no position to purchase anything. Next time, I am keeping mine.
Next show that I attend, I will be keeping the "registration badge" that was issued to me upon entering the expo. If
B&H gets wise, they will probably be asking for a picture image containing me, the badge, and a Tx Drivers license card.