I understand that I have to have a shipping case as listed in the rules (or somewhere around there), but what about inside the shipping case? How do you package your prints inside the case? My case is a little bit bigger than I need, and I don't want my prints to 'slosh' around, so I am thinking of putting some cardboard or something around the prints to keep them from moving. Is it okay if we put the prints in a box that goes inside the case? I don't want to get disqualified for making it difficult for the print handlers.