Man in the box(bought through the new support pack)

This box(the decoration of Faustus,got from the new 30USD support pack) is damnly so noisy in hideout.
And i found its sound does not belong to anyone of the volume in options.
How may i lower its volume? Or can i disable its sounds?

For certain reasons, I have to turn down the in-game volume and turn up my headphone volume (I need to play with a mate whose microphone isn't very good). And This box is just too noisy, and it keeps making strange sounds on its own