The Federal Housing Finance Agency knew or should have known about improper foreclosure practices involving Fannie Mae affiliated law firms long before the Finance Agency began a review, according to the regulator’s official watchdog.The FHFA Office of Inspector General’s latest audit found that the FHFA did not investigate complaints about Fannie’s Retained Attorney Network until August 2010 in the wake of negative news reports alleging that RAN attorneys had engaged in inappropriate foreclosure practices, such as routinely filing false documents in court proceedings and “robo-signing.”