If having confidential documents that the president can at any time declassify, then every president would have been investigated. Trump is said to have 13 boxes of documents, Obama is said to have taken 51 boxes when he left the White House, and others have taken many boxes themselves. Where's the precedence in investigating former presidents for the documents they took? This is a fishing expedition brought on by a partisan government to destroy a person they believe never should have been president in the first place.When Trump left the white house, he (aka his aides) packed up a few boxes and they wound up in Mar A Lago rather than DC (i think the treasury?)where they were supposed to go. Once DC realized this, they requested the boxes from Trump, so he had his people get them to DC. His people missed a few boxes, and as DC was going through the boxes they did receive, they realized there were some confidential papers in the mix that weren't supposed to be in there. Knowing they still had boxes at Mar a Lago is why the FBI got involved and they showed up during normal business hours.
It's not as exciting as any news Channel would have you believe.
Redundant replies to all complaints will be made available for display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying ‘Beware of the Leopard’.The Redundant Department of Redundancy has filed a complaint about this, in quadruplicate. New copies distributed daily.