[Runscott]

If you aren't adding anything to the item, I don't see the issue; however, I also would mention that the photo once had crop marks, and that those have been removed. Why not mention it?

Also, as Leon mentioned, the crop marks show the interesting history of the photo, so I wouldn't even try to remove them unless they made the photo look dumb; for instance, I had a photo with a black circle drawn around the player's head - I would remove that. Also had a photo where white crop paint had x'd out a player who added to the photo's composition - I would certainly remove those.

Thanks for sharing your technique previously.