DirecTV access cards

DirecTV users: Have any of you recieved an envelope in the mail recently with new access cards for your DirecTV receivers? The letter states that these cards replace the existing that are due to expire soon. When did this start? I've been a DirecTV customer for 3 years and still have the same access cards in my receivers as when I got the service.
Now - I need "new" cards, that must be installed, and the old ones destroyed. No where in the package does it have an expiration date for these cards, and, my subscription anniversary date is February - this is July. Before I contact DTV customer service, I thought I'd see if anyone here has gotten a similar package.