Let object disappear behind real wall

Hi,

So I'm making a 3D popup book using AR. And I have a box that you can look into in real life (front face is kept out). And in the box I have a virtual object. However, when I look around the physical box the object within the box is still showing. Is there a way that I can make sure I only see the object when I look through the front of the box? So when I look around the box the virtual object will disappear behind the real physical box faces?

Thanks in advance!