You need a see through box with a lid with holes in it close to a window. If he really wants to end his life he'll work out for a few months and find the strength to push the entire box OUT the window.
He's just really bored in his box, he can't see anything and he wants to come out and play. I try to keep him out while I'm here. I'm gonna have to cover the box with a sheet or something to keep him in when I'm gone.