What if the neighbor across the street always hoards his garbage in the public meter box?

This kind of thing can only be negotiated, which is easier said than done.

Tell him the truth, say that you can do it, you are responsible for the fire, and let him sign a list: because I put sundries in the meter box, if there is a fire, I will be responsible for all the losses.

As soon as you let him write like this, he must have taken it away.