Dude, beware of bottle bombs!!! I would recommend putting all 12 bottles in the box then put said box in a plastic garbage bag. That way if they do detonate cleanup will be easy. 3 volumes shouldnt be an issue, just over carbed, once they have a chance to condition pour the beer into glass and allow the carbonation to release its self a bit. Either way tho, just take the safe side and put the box in a garbage bag!