Situation is that I originally sent one with USPS registered mail 2 weeks ago and it still not there.
Two days ago, I made same packet and shipped it with FedEx and got delivered yesterday.
I tried USPS package intercept and got notification from USPS saying intercept fail. I currently have 1 packet with USCIS that was sent thru FedEx and 1 packet on its way to USCIS thru USCIS. They are exactly same packet. What could happen here?