Here's what I did to a car parking in front of my house... put something under the windshield wiper that looks like a ticket or warning message... I just used a flyer... the next day it was gone, so I knew that someone was in fact at least looking after their car there even though it didn't seem to move for weeks... I realize your situation is different, but it might be a good idea to see how long it stays under the wiper to see if anyone even cares about this van
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