I don’t get it.
One way of articially aging the appearance of a document is to lightly burn the edges, and as the article indicates, stain with coffee. We made treasure maps in cub Scouts using these techniques.
I’m in no way, shape or form, sympathetic to Comey in any manner, but this one is a stretch. People should be less concerned about his burning the edges of the DOI, and more concerned about his using the Constitution as toilet paper.