On the boundary? That seems somewhat reasonable. If they were much further apart than that, you could reasonably claim that you entered the property without knowing it was private.

yes on the boundaries. it varies by town but some of them require you to change the sign each year and keep it up to date with the town. so it's like an annual task for a landowner who typically has a million other tasks to do. here is an entertaining video series related to this: https://www.youtube.com/playlist?list=PLc-AG0_QlqbCo_rhLic0A...