Once when I was going on vacation, called in sick the Friday before. Was gone for 2 weeks. When I came back, there was a ton of yellow sticky notes on my door from UPS trying to contact me. I was single at the time so no one was home during the vacation. They even sent LP to the airport to try and find out when I left. Our LP was wanta be Detectives. They couldn't prove anything and not a word was said to me when I went back to work. I think when I called in sick, the planes flying overhead at the time might have made them suspicious. This was before cell phones so I was in a phone booth. So yes they do have addresses.