Trump says "it was all declassified" — how declassification usually works

 https://www.cbsnews.com/news/trump-classified-records/

It is also unclear how central a legal question the classification process and the president's role in it could be. As the New York Times points out, none of the statutes cited in the warrant rely on whether the records were classified or not. The search warrant signed by the Florida magistrate judge entails items "illegally possessed in violation of 18 U.S.C. § § 793, 2071, or 1519."