If the booking was made before hitting AA Gold, it's possible the status has not been updated. I had this problem when I first hit BA Gold. I travelled about 4 days after status was showing on the website, but the BP still printed showing me as Silver. It might be worth calling AA/CX to get your AAdvantage number re-entered into the booking - the status should then update.

If you are worried about being denied the benefits entitled to you, a printout from the AA website showing your status should suffice.