My fireproof box is the 1100. I bought it MANY years ago to hold my backed up photos (on USB sticks). Recently, I tried to open it & assumed I had the wrong key -- as the key that I THOUGHT was correct did not work. Spoke with someone and I ordered spare keys online. Same problem with the new keys! Was told my lock had "gone bad" and I'd have to somehow pry the box open. Really frustrated that I paid for new keys.