Washington – An employee at former President Donald Trump's Mar-a-Lago resort seen on security camera footage moving boxes that have become a key part of the FBI's ongoing investigation into Trump's handling of presidential records is a former White House culinary worker and Navy veteran, a source confirms to CBS News. Walt Nauta – who served as a White House culinary employee from 2012-2021, according to his service record –  told investigators that the former president directed him to move the boxes to a different location as the federal investigation was underway, an individual familiar with the investigation says.  Nauta, a native of Guam, is now a witness in the Justice Department's probe – which escalated after the execution of a search warrant on Trump's Florida residence in August – and has appeared before a federal grand jury in Washington, D.C., CBS News has learned. Investigators are interested in Nauta's firsthand knowledge of what he told investigators was Trump's directiv