Contact USCIS to inquire directly about your case status.

It is not advisable to travel but you should consult with an attorney for review of your case.

Yes you may use another envelope for submission.

You can either leave blank or indicate N/A.

Contact USCIS directly to inquire about case status.

Yes this is advisable to understand the immigration consequences.

If you are adjustment eligible you may based on pending I360. Consult with an attorney for guidance.

Best to consult with a tax professional for guidance.

Make efforts to obtain duplicate originals or certified copies.

This could render him deportable as it is a false claim to citizenship.