It is as though Trump sat at the dinning table with press clippings and top secrets and piles of mixed papers piling up, until aides brought a box, plopped the pile in the box and put the boxes aside to make room on the dining table for more top secrets, press clippings, and boxes.

When the White House squatters vacated, they grabbed the boxes and tossed them into the moving trucks.
When the FBI grabbed the boxes, they found that the press clippings mixed with the official government records, essentially dated the creation of the table pile.

Top secret nuclear secrets' papers found in boxes with press clipping dated from ? to ?, suggests the time period wherein Trump kept, stole, failed to return the classified hard-copy as required by law.