Currently, under the Presidential Records Act, incumbent presidents are for the custody and management of the records of their administration while in office.

Source: https://www.msnbc.com/opinion/msnbc-opinion/trump-biden-pence-exposed-antiquated-washington-classification-system-rcna67536

Perhaps the reason has something to do with all the high-ranking government officials who have not been charged for negligent handling of classified information, none of whom were covered by the Presidential Records Act.

Source: https://www.dailybreeze.com/2023/06/18/the-federal-indictment-against-trump-could-fail-just-like-all-the-other-attempts-to-get-him/

“Recent media reports have generated a large number of queries about Presidential records and the Presidential Records Act (PRA).

Source: https://hotair.com/jazz-shaw/2023/06/10/the-bizarre-claims-emerging-in-the-trump-documents-case-n556995

“The Presidential Records Act and the whole archival system depends on good faith,” he said.

Source: https://www.nytimes.com/2023/01/27/us/politics/national-archives-bush-classified-documents.html

Under the Presidential Records Act, White House records are supposed to go to the National Archives once an administration ends and regulations require such files to be stored securely.

Source: https://royaltimes.net/classified-documents-found-at-mike-pences-home/