So are we all playing lets pay US Marshals as little as we can?
The buyers will state they paid more than they actually paid, to be able to file a lower gain later.
The marshals will say it was lower than the actual price, the difference entered into a slush fund to use for random gifts to friends. Selectively, they might report a few customers to the irs.
Not much of a conspiracy theorist, but i can't imagine that that information would not be released. In fact i can't believe no one has did the research on this to see weather US Marshals released the prices before on mansion and such even with freedome of info requests?!?

Just too lazy to research this myself