I've looked into it and I believe Scott wanted the box opened, but he didn't open it because no one solved Fnaf 4, which I hope to do on my YT channel someday.
THEORY: WHAT IS IN THE FNAF 4 BOX? WELL STRAP IN CAUSE THE ANSWER IS WILD: THE CRYING CHILD’S BODY PARTS! IN FNAF WORLD GLITCH FREDBEAR TELLS YOU TO FIND “PIECES” AND PLAY MINI GAMES. SOMEONE TOLD ME THAT TO OPEN THE BOX CLICK THE LOCKS 7 TIMES. I DON’T HAVE FNAF 4 YET BUT I WILL LATER. SO FOR NOW YOU GUYS GIVE IT A SHOT.