By mid-week you should receive 2 e-mails from Sun. One e-mail will give you your Sun Certification ID and have information on how to register for the Certification Database. If you do not get that e-mail, send a message to firstname.lastname@example.org to ask about it.
Two to three weeks (or longer if you are not in the U.S.) after you register into the Certificate Database, you will receive in the postal mail a welcome kit containing your SCJP certificate and a small plastic wallet-size ID card that indicates your SCJP status. Your score is not printed on them. If you do not get that package then send a message to email@example.com to ask about it.