I'd go out to retrieve a Landy if it was near me and the owner knew I was doing it. I'd happily steal it back and and get it to it's owner and post the thief's details for everyone to see. If I saw someone stealing a Landy, I'd but a dint in their head with whatever shovel/pipe or likewise was nearest.
I wouldn't offer a reward for my car back or expect a reward because that's not the point. The point is to do something good for someone. I think a pint or two might be in order for the person who brought her back to me.