This is the box for DS game Dragon Ball Origins 2, or at least that's what it'll most likely be called when it's brought over here. Anyway, the game in Japan features a full sized fully working Famicom cart inside it's DS game box : /
Gotta love it, sadly it's highly doubtful this will happen in the West.
I really love old Famicom carts, they have a certain aesthetic quality that I really admire, some of the original labels were fantastic, but new one's made today as art are equally awesome.. If you've any interest in them also, and would like to know more about them as an art form, check this site out: