Courtesy copy
Kannan,
Have you received your courtesy copy? If you have received it, you may go ahead and get stamp on your PP. Yo u do not need the original copy for stamping.
It normally take about 5 days to get any mail from INS. Therefore, if Ins mailed your approval notice on last Monday, it should have reached you on Saturday. Give it a copuple of more days and it should be with you today or tomorrow.