A box includes a base having an upward extending peripheral fence, a pair of side panels each having a lower portion pivotally coupled to the base, a front panel and a rear panel detachably secured to the base and the side panels. A frame is engaged on top of the panels. A cap and a cover are pivotally coupled to the frame. The cap has one or more openings for voting purposes. The panels may be engaged in the frame and engaged between the base and the cover for forming a compact folding structure that is excellent for storing and transportation purposes.