Crude
You basically gave up a lifetime's worth of fun for a cheap laugh.
The way to do it is to restore the hidden pic directory along with everything else, but remove the -h attribute. Also remove it from one or two system files in the root directory. Casually mention that your backup program occasionally messes up file attributes.
At some point later make sure he catches you glancing at his wife and smiling. He'll always suspect that ypu've seen the Pictures, but he'll never be sure. It'll drive him nuts and provide you with a steady supply of fun.