Approved I-485, but no card??

Through congressman's help, I was told that my case has been approved on Aug. 2, 2011, then I should receive the card in 7-14 days. Now I still have not received. Since I have to return to my old job if I have not received the card before Aug. 31st. Is there any other ways to check where the card has been sent, I guess I should trust the response from congressman about this approved I-485, right? Need your help/advice.

Thank you!