Maybe you can just photo copy the policy and drop it in their mailbox anonymously, as you don't want them to know you are the ones?

Yup, could be worse. My next door neighbors bought a new mattress and box spring in January. Guess how I know? Now the mice have found it makes a great nesting place. Actually the entire back yard is a disaster. And due to the layout of the houses, garages, garden sheds, I am the ONLY ONE who sees it!!