To be safe, you should contact your employer to find out why
you received two W-2s from them.
Sometimes there is a reason for that to happen, such as when
the company goes through a payroll company change or something similar that
will require two separate W-2s.
You should also take a look at both of the W-2s to be sure
that one of them is not a corrected
W-2. There is a check-box on the form to
indicate that it is corrected. If that
is the case, the corrected W-2 is the one you should enter.