Don't loose sleep over it. It is a rejection letter. I received the same one. I wasn't home when the delivery was attempted either and had to pick it up the next morning at the Post Office. Pretty much killed my day. So then I had to go to work with the realization that I would have to keep going to work at this place for the indefinite future. Then I got over it and realized that maybe it's for the best and I shouldn't fret over it.