In the Goblet of Fire when Barty Crouch Jr is acting as Mad Eye Moody with use polyjuice potion where was real Alastor Moody?

The real Alastor Moody was imprisoned in a locked trunk in Barty Crouch Jr.'s possession.

Crouch Jr. used the Polyjuice Potion to transform into Moody and then imprisoned the real Moody in a trunk he kept hidden in his room at Hogwarts. He later revealed that he had used a powerful silencing charm on Moody to prevent him from being discovered.