I enabled "return other peoples objects after <1> minute" today, for the first time ever. This was on my parcel in Natoma.
Immediately (not in one minute), a number of objects that most definitely belong to me (i.e. my front door) were returned to me.
I am certain the objects belong to me, were not deeded out in any way to anybody else, and were not part of a group with edit rights.
As the feature appears to be broken, I shut it off before my house was torn to pieces, again, by the system.