Once the officers leave, it would be completely reasonable for the Bishop to say, “Ok, I got you off the hook. Now give me my stuff back.” But he doesn’t. He gives it to Valjean but with the expectation that he use those stolen items to restart his life as an honest man.
This is a life-changing event for Valjean. And it’s a great metaphor for grace. Merely canceling the
"But remember this, my brother
See in this some higher plan
You must use this precious silver
To become an honest man
By the witness of the martyrs
By the Passion and the Blood
God has raised you out of darkness
I have bought your soul for God!"
-- Josh Benner