For mine Oracle contacted me the day after I passed via e-mail requesting I followed a link and verified my contact information for them to send the packet. I am not 100% positive that this is the only way it is done, but I would assume they will be contacting you. The link to their certification manager/database is http://www.certmanager.net/sun. Congrats on passing the exam!
Swaraj, as Bobby says, I too got a mail from Oracle and followed their link for verification.
I guess we both completed the certification on the same day, so you must have got a mail from them by now.
If not try mailing to email@example.com. (This mail id, I got from my mark sheet the prometric center gave me)