How do you mean ripped off? As in stolen, or ruined in a grounding? Big difference.
In a GB of wood, if grounded, I would be more worried about the hull and frame damage than the shaft.
If stolen, contact local scrap dealers. let them know you are in the market for a propellor, shaft, and rudder from a boat that may have come in recently and you would like to 'purchase' it back for scrap value. Then, if you find it, I would call the cops to see who 'sold it'.