A part: is that it is a place where I could take my daughter to lost-and-found to ask about an acorn, knowing that someone would return an acorn, knowing that someone would clearly expect a lost acorn to be returned and therefore ask.
My last encounter with police in Japan was walking approximately a mile to the station to drop off a Swiss Army knife abandoned in a park where children play. I was advised to call them next time so that they could come pick it up.