@TheVoyger1234To clarify: The special "Launch Edition" of
Radiant Historia includes some extra stuff (decals and an artbook). Together with the game they are packeged into an extra cardboard box. The cardboard box hase some unusual dimensions, because of the included artbook.
@skullpand86I think it would be best, if you either scanned the entire cardboard box (with all the flaps, similar to what people do with GameBoy boxes on
Nintandbox.net). So people could make (fold) their own box out of cardboard.

Or if you made a custom cover for the Launch Edition, that fits regular 3DS cases. (I don't think, people would want to have a DVD case among their 3DS collection.)