If the PAN card is lost or you wish to have a new PAN card with existing details, then you can apply for a duplicate PAN card by submitting the Form for "Request for New PAN Card Or/ and Changes or Correction in PAN Data" and a copy of FIR may be submitted along with the form.
If the PAN card is lost and you don't remember your PAN, then in such a case, you can know your PAN by using the facility "Know Your PAN" provided by the Income-tax Department. This facility can be availed of from the website of the Income-tax Department - www.incometaxindia.gov.in
After knowing the PAN you can apply for a duplicate PAN card by submitting the "Request For New PAN Card Or/ And Changes Or Correction in PAN Data".
For further queries or support, you can drop an e-mail at support@myITreturn.com