@BirkiLady actually the city probably wouldn't know. We get our electricity from the neighboring city. Surprisingly, though the yard is looking rather ragged, it hasn't grown to the point of being a nuisance, at which point IF somebody complains code enforcement would get involved. But, since they're not there for code enforcement to get in touch with their hands are tied. All they can do is fine them. We ran into that problem with another neighbor. The guy was deadbeat, but his father who lived in another state actually owned the home. City couldn't do anything about it.
If they flew the coop on purpose would they go to the trouble of extending their mail hold? I would think they would just leave. And, as I said earlier, they left an expensive sport car behind. That could pay for a whole lot of hamburgers.