I don't believe there is a 'box' available for the Decklink Studio, however there is a rather large breakout cable. I was able to order the cable for a Decklink HD Extreme 3D card via Markertek for about $100. You may try calling them and see if they can get one for you.
I wish they would make an optional breakout box. Apart from the convenience, the weight of the breakout cable of the Decklink Studio 2, with all those connections, actually makes the card come unseated over time. I've managed to support it with a Rube Goldberg contraption, but I still have to periodically reseat it.