We discussed this in my political science class. None of the students knew you were even supposed to report that. The professor roundly mocked the girl who started freaking out about it.

(We were talking about revenue the government 'fails to capture', which brings to mind Secret Service agents chasing winged dollars with butterfly nets. When the professor asked for examples, the first thing that fell out of my mouth was 'Moonshine?' She said my heritage was showing.)