Go to the AWS Website. Go to the CWI Check. You can now use personal information as opposed to the CWI number to find out if you are listed.
While you can figure out most of your number, if you have passed an exam, the personal identifier numbers must be guessed at.
As quick as AWS has gotten at scoring exams and sending out "Congratulation" notices I don't know why one would not just learn a little patience and wait for the notice.
Have a Great Day, Brent