An apparatus for sealing a box having four top flaps initially disposed in an open position. The apparatus includes a conveying system for conveying the box from a first end of the apparatus to a second end of the apparatus. The apparatus also includes a flap folding system for folding the top flaps of the box into folded and horizontal positions as the box is conveyed from a first end of the apparatus to a second end of the apparatus. The flap folding system has a first flap folding member configured to fold a fourth top flap of the box, a second flap folding member configured to fold a second top flap of the box, and a pair of oppositely disposed side flap folding members configured to fold a first and third top flaps of the box so as to abut each other. A tape dispensing system is configured to dispense tape across at least a portion of the third and fourth top flaps of the box in order to maintain the third and fourth top flaps in abutment with each other, thereby sealing the box.