Since when are biographies classified? The investigation results would disagree with you.
On January 20 the FBI conducted a 13-hour search of the entire premises of Biden's Wilmington home. The next day his personal attorney Bob Bauer revealed the search, saying that the agents had examined "personally handwritten notes, files, papers, binders, memorabilia, to-do lists, schedules, and reminders going back decades".
They identified and removed six documents containing classified markings from Biden's home office, some from his time in the Senate and some from his vice presidency. They also took possession of some of his notes. Biden and his wife were at their home in
Rehoboth Beach, Delaware, at the time. CNN reported the search was conducted with the consent of Biden's attorneys, so a subpoena or search warrant was not required.