There is probably no harm having this semi official deal with what he has. What if it had been your expired carcass behind the house?

Sure it may even have exceeded the understanding of function but since he has held the position for twelve years. Unless you suspect some major character flaw he was doing you no harm. His intent may even just have been helpful in nature as an individual.

I was also thinking if you wanted no trespassing signs to that effect should be present. Otherwise random intrusions upon our properties without criminal or overzealous intent by an individual are of no great concern.

On the other hand some property owners in some given areas may be justified if there is too many negative incidents in their area.