Aaaand I'm stuck :-) Not user what to do with what's in the box, with the puppet and with the symbols on the window ... either I suck or perhaps it's too obscure ;)
I got stuck in the same place and, while messing around with the keypad code entry and seeing what pictures I could make with the shapes, figured out the next step by accident. So my hint is: play around with that keypad, see what shapes you can make, and if there's anything in the room that looks like those shapes.