Just to reiterate what has been posted in the previous reply, you do not need the original approval notice for stamping. The courtesy copy is enough. In fact, when I showed my original approval notice, the officer said, "You live in SF, you should go for stamping at the SF office". (The lawyer's address is in San Francisco, but I live in San Jose). Then I showed her my courtesy copy with the SJ address and she was ok with it.