In most cases, the PB faces the street and has a transparent door, so there’s no mistaking a PB for a public pantry. For the rare PB not facing the street, I view the front of the PB to determine whether it’s a Little Free Library or a PB. The two public pantries I’ve seen so far were obviously not PBs and were accurately labeled by the owner.

Great work, that’s some neat detective work. How come the NID wasn’t your first resource to find the dam? Are erroneous dam points typically not that far away from the correct location?