I am not a lawyer, but if you wanted to float "it happened by accident" then having people willing to say "oh no, there was a HUGE amount of intentionality behind what boxes went where" and "he had really good recall of what was in which box and even in what order" can't really play very well.<p>I believe that the basis of his legal peril isn't the boxes exist: it's that after he was told, he obstructed justice by not immediately volunteering everything up. So at one remove, "he knew" is neither here nor there.