alt Hacker News" Biden's personal attorney said on January 21 that the Justice Department discovered six items containing classification markings during a consensual search of his home the previous day, some of which dated to his tenure in the Senate; investigators also seized some of Biden's handwritten notes from his vice presidency."
"On November 22, 2022, Biden's attorneys discovered the first set of classified documents in a locked closet...they reported them that day".
If you're in possession of a calendar, you will notice that November 22, 2022 is actually before January 2023. You might also note the "consensual search" in your own quote.
So a normal person might conclude that the Justice Department called Biden after he reported on himself, and said "We see you said you had some documents, so maybe you forgot some more? Can we come search with you?" And Biden maybe said "Good idea."