Here is a link that shows the actual sign:
http://languagelog.ldc.upenn.edu/nll/?p=522
I think it is telling that no one noticed for a month or more.
These idiots would never have been caught if they had not posted a web site about their crime and boasted about it.
Most criminals are caught because they cannot keep their mouth shut.
They claim it will cost 5 grand to remove some white out and Sharpie from that sign? Ridiculous. I’d do it for 4 grand.