Because the press chose not to make a big deal of it. Past OIG reports and audits aren't secret, just buried in a mountain of public information.
-- Are there any consequences to the person or persons who made this error? --
It's not one error, it is thousands of errors, made by thousands of people. Some of it is fraud, probably 20% of that is caught.
RE: Some of it is fraud, probably 20% of that is caught.
Well, if so, we ought to have an AUDIT ( there’s that word again ) of WHO or HOW MANY PEOPLE perpetrated the fraud and FIRE THEM ( and I’m being very lenient here, they ought to be tried and jailed if found guilty ).