HOUSTON – If your second stimulus check never arrived, you may be able to track it down by requesting a payment trace. You have to listen to the recorded message before you can connect to an agent to make the request. Or you can mail or fax a completed form 3911. Mail the form to:Austin Internal Revenue Service3651 S Interregional Hwy 35Austin, TX 78741You should not mail Form 3911 if you’ve already requested a trace by phone. And you should not request a Payment Trace to determine if you were eligible to get a check, or to confirm the amount you should have received, the IRS said.