erm……describe the box? I take it it's not got 6 sides? Has it got no top, and you'll be photographing from above or what? How big is it?
Can you describe the scene a bit clearer?
Where will you be shooting from/where is the box etc.
Do you have a tripod? And can you control how bright/dark the room is? If you can't, what type of exposure do you anticipate for the room to be as you want it exposed in your shot?
My first thought would be to make it pretty dark & then set a long exposure (seconds) and shine a torch into the box to illiuminate it.
Or take two exposures using the camera mounted on a tripod – one exposing the room how you want it & the other exposing the box. Overlay them in photoshop & mask off everything but the box in your 2nd exposure.
EDIT – forget all that crap above. Just read your thread properly…….
Either make a ring light as suggested or use torches to 'paint' the box.