I will keep this brief. The Trump indictment has been unsealed by DOJ. You can read the PDF here.
I will provide two quotes from the early part of the document.
3. The classified documents TRUMP stored in his boxes included information regarding defense and weapons capabilities of both the United States and foreign countries; United States nuclear programs; potential vulnerabilities of the United States and its allies to military attack; and plans for possible retaliation in response to a foreign attack.
5. . . . Nevertheless, TRUMP stored his boxes . . . in various locations . . . including in a ballroom, a bathroom and shower, an office space, his bedroom, and a storage room.