If the docs weren't in those specific boxes then they were elsewhere very close by.
As others here have said, you may want to read up on this. The almighty Joe already slipped up and said, while at the podium and on video, that the documents were in his garage next to his corvette. If they were not in those specific boxes it doesn't matter because that is just a hell of a good image to use on a meme site and to get libs' panties in a wad.