Make TWO copies of the entire package before you send it in. This includes the money orders too. You want to have a perfect replica of the package you are sending in. All Forms that you submit must be originals with original signatures. Supporting Evidence that you submit may be photocopies. Retain ALL original supporting Evidence since the USCIS has the right to check them by issuing an RFE (Request For Evidence). If you receive an RFE, follow the direction exactly, and make two copies of what you sent back. During any future interviews the USCIS may also want to examine the original supporting evidence.