The Marionette's box is the box you see in FNAF 3 theory.

Here is a picture of the Marionette's box.

Here is a picture of the box you see in FNAF 3 with the toy animatronics in there.

Don't the boxes look alike. In the FNAF 2 minigame when your playing as the Marionette, aren't you giving life? Or he is inside that box.