Neutopia,
Think of the company you keep, or have kept. Sometimes there is a connection. I mentioned a few stories in a prior post, in this thread.
With people I've known, it's usually people who have borrowed stuff, then taken their time to return it. Some stuff I've let go, usually books. That's why I only loan so much of certain things, if I do, and I always keep in mind the chance I may not get it back, and if I do, not the condition I loaned it.
10+ years ago, I had someone ignoring my phonecalls. I even sent a postal letter. They ignored that, also. So, I drove to their house, about a 2 hour drive? I forget, to get a movie back. They gave me the movie when I arrived there. Then, got the excuse, "Oh, we didn't get back to you, because we didn't have the money to post it back, and didn't know what to say, etc.". later, the other part of the couple called, since that person heard from their significant other I just showed up at their house to get my movie, and apologized, etc. Seems a bit wacky, typing the story now, but it bothered me a lot at the time, and it was within a driving distance, so...
I knew them for a while, also.
Sometimes, think of people, even if you knew them for ages, that even if you didn't have a falling out with, that you just haven't spoken with, in a while.
Also, alarm systems, hidden video surveillance (Cheap, nowadays. Don't tell anyone where it is, though, then it's no longer unknown.), insurance, all good stuff.