Yup. call em.
I had one of my cars parked in the street ONCE and she went and wrote on a piece of our mail not to park there. In front of my house is the street, then 4' of sidewalk, then the yard with the mailbox in it.... They drive up the sidewalks!! Heck, they have to park and walk to deliver the mail almost everywhere else in this neighborhood.... why not the little 600' of street I am on?
I think they just get lazy. Once you make it easier, God forbid you take that away. I never called or anything since I didnt care THAT much, just seemed rude to write on my shit