Thank you for clarifying. As a foreigner, I was never allowed to rent without registering, so it slipped my mind that indeed for citizens it may be the case. Ne

Thank you for clarifying. As a foreigner, I was never allowed to rent without registering, so it slipped my mind that indeed for citizens it may be the case. Nevertheless it’s a security issue like OP mentioned, someone can change a letter or change their name to yours for a day on the sticker and get your mail.