Hey.. First off, congratulations on passing all the written elements at one sitting!
As for the FRN, it will be generated when you get your tech license, but it's not completely necessary, and you'll need more than that. You should have gotten a CSCE (Certificate of Successful Completion of Exam) after you passed your Elements 2, 3 and 4. This is all you need to show when you take your code test (along with the standard ID, etc) for them to process your license as an Extra class operator.
If you don't have your CSCE, contact the VE team you took your exam with RIGHT AWAY. Even if you get your FRN and tech license, this won't show that you passed elements 3 and 4. The CSCE is NECESSARY to show this. As a matter of fact, nothing is filed with the FCC besides license grants and upgrades; it is the VEC that has you on record as passing the Elements 3 and 4 -- the FCC doesn't even know about that yet if no General or Extra class license has been granted.
If you have your CSCE, that's all you need. (Just make sure your name and address on the forms for your code test are EXACTLY the same as what you put on the form 605 for your last exam session, so things can "match up" once they get to the FCC).
If you don't have your CSCE, contact your VE team IMMEDIATELY!
Best of luck!
Chris / AG4WX