Repro following these steps:
1. Have another user or an alt create a few objects in a region you own or have management abilities.
A word of caution, make sure whoever creates objects for you to these with does NOT have any other objects in the region. Just in case it decides to work as advertised.
2. Using the account that has access to the Region/Estate menu, Click World > Region/Estate.
3. Click on the Debug Tab.
4. In the Object Return area choose the avatars name that owns the objects you wish to return.
5. Hit Return button. Expected: All objects owned by chosen name get returned. Actual: Nothing happens.
This is a feature that should have been available a long time ago and recently I figured out why. If someone decides to scatter 500+ prims about your region you have to wait for someone to act on your AR. Being a private estate more than likely your going to be the only person to file an AR for such an event. So you could end up waiting around for days because you have a low priority on the list as being only one reporter. You wait and the resources of your sim get eaten up or you can search and return one by one but who has time for that?
I linked this to the original MISC feature request.