Potential FFL03 problem!

So I had a problem mailing the application saying that the address that was I the application ( Federal Firearms Licensing Center P.O. Box 6200-20 Portland, OR 97228-6200) wasn’t showing up as an address in the USPS system! They said that they had to type it in manually which I agreed to. My concern is that someone who isn’t supposed to be getting the form has the form! I did buy tracking on it and it did get delivered today! It looks like someone successfully “Delivered, Individual Picked Up at Postal Facility”. I’m curious as to if we’re on the right track of getting this thing done!