well, i would not listen to those above answers.
not everyone left on good terms with their job and boss so why would they want to speak to them and give them the address to their new place....
the proper thing to do is contact USPS post office and do a change of address form. That way all your mail, because we don't only just get w2's as mail, will be redirected to the new address you told the post office about.
that's how to do it correctly. not everyone wants to tell their old boss their new address.
