If you hand write your answers, use black ink. Make sure that everything you write on the form is clear, so we can easily read the information on the scanned image we produce when we process your form.
Mark the envelope and the cover letter with the type of submission. For example, Original Submission, Application to Register Permanent Residence or Adjust Status (Form I-485). Mark the envelope and the cover letter with the form number.
You can call the USCIS hotline and request they send you a new receipt.