Fuji,
I remember your id. Congrats on your approval.
That must be quite relieving.
For stamping, I would say it depends on the Office to Office.
I went with a e-mail printout of my approval and got my PP stamped.
12-13 days later I got my actual card too.
This was possible for me at Arlington, VA 's office. I was told by guys from New Jersey's office that ppl with e-mail printout were sent back.
In your case, since you have a courtesy copy, you should be okay.
All the best.