The last lot of hives I purchased were 'abandoned'.
They hadn't been touched for 2 to 3 years. The previous owner was too old and frail to get up to them, but he knew where they were, and what was there. Family had no interest in them. He wasn't in the local association (can't say I blame him, they act like its 1954), and he didn't list them on beebase.
Had someone tried to list them as abandoned, or muscle in and take them, he wouldn't have known. They were hidden away on private land. However, if this had happened, it would probably have led to a police report for theft. As this country doesn't have a 'finders keepers' law, anyone who removes anything without the owners permission is committing theft. Just because something looks abandoned, you don't always know the back story.