No, it's not harrassment. Obviously she's being protective.

However, you know how it works - in divorce law gifts aren't returnable. Once something is given, it's gone. But I'm sure there are ways to get it back. If I was you I'd just ask a big guy you know to go around and collect it... Hopefully some time the wife was out.

Tell him you'll make things between him and his wife far worse if he doesn't give it back?