You should read all of Andy’s piece on the latest documents, and this passage is particularly key to understanding how they went about handling the matter at the beginning:
Remember the timeline here. The first batch of classified documents was found illegally stored in Biden’s office on November 2 — i.e., over two-and-a-half months before the FBI finally conducted Friday’s search. Contrary to Biden’s claim of self-reporting, he did not report that discovery — evidence of a serious crime — to law enforcement. Rather, his private lawyers reported it to the Biden White House, which then notified not the Justice Department but the National Archives and Records Administration (NARA). It appears Biden was hoping NARA would just return the documents to the files and no one would be any the wiser.
The discovery, however, came to the attention of NARA’s inspector general — the watchdog official who reports agency wrongdoing to Congress. It was the IG’s office that, on November 4, notified the Biden Justice Department.