how do you know it got lost in the mail? the IRS is far behind in processing returns. some which were filed in February still have not been processed. even after a return is fully processed it can take a week or two before a transcript shows up. only if you are positive the return got lost in the mail should you mail another copy. in fact if it was truly lost, you can go back and e-file. should you attempt to e-file and get reject code R0000-902, the IRS is stating they have already received and accepted a Federal return for the current tax year with the Primary Taxpayer's SSN.
