I had my N-400 interview about 6 months ago. I called immigration in late June and asked for an inquiry regarding out of processing time of my application. About 2 weeks after that I got a letter from immigration saying that my oath ceremony had been scheduled for August 11/2013. A photocopy of N-445 (not the original yellow notice) was enclosed in the letter Now it is about two weeks to that date. I have not received an official notice (yellow N-445). I called the CS of immigration and they told me that I would need to present the photocopy to attend the ceremony and no needs for the original. What should I do? Is a photocopy acceptable to be accepted to the ceremony, if I do not receive the original N-445?