National Archives just wanted the documents he refused to give up and that he probably won't get in any trouble. And I think he probably won't be prosecuted because of politics. I would not be shocked if Biden and his DOJ don't end up prosecuting because it will feel like a ticky tack law that he broke and that they are just going after Trump.
https://www.newsweek.com/exclusive-informer-told-fbi-what-docs-trump-was-hiding-where-1732283