I have heard of this kind of thing happening before — to other people. Now I know these other people weren’t joking when posting lost and found misdirected mail notices on the American Immigration Lawyers Association online discussion forum: “Got someone else’s approval notice — any takers?” Just received a letter from the USCIS that was intended for another attorney in another city, but was enclosed in the same envelope as my letter. Had to scan and email the letter to that attorney. Hey, saves a stamp. I tip my hat to the USCIS customer service wizards.