In answer to Cow Taurog, if this helps, one of my SL sisters got the object and must have rezzed it, and I located the invisible prim it placed at 4000m at inspected it. It shows the creator's name as Ordinal Malaprop. I have the object blocked but since the land is not in my name am unsure what to do next. I also came across one in a premium sandbox, and blocked the owner.