“At least one lawyer for former President Donald Trump signed a written statement in June asserting that all material marked as classified and held in boxes in a storage area at Mr. Trump’s Mar-a-Lago residence and club had been returned to the government,” the New York Times reports.
“The written declaration was made after a visit on June 3 to Mar-a-Lago by Jay I. Bratt, the top counterintelligence official in the Justice Department’s national security division.”
“The existence of the signed declaration, which has not previously been reported, is a possible indication that Mr. Trump or his team were not fully forthcoming with federal investigators about the material.”
This explains why the obstruction of justice statute was on the warrant.