My company has filed PERM application for me earlier this year. I have been told that it is still under processing. Until now I have only received the PERM Case Number from my company. I have not received an "receipt notice" document or any other document from my company to show as the proof of filing of PERM. Can someone give more information about proof of PERM filing? What documents (e.g. Receipt Notice) does company receive from USCIS upon filing of PERM application? What documents should the company share with me?