answer: #Person2# found a watch. #Person1# claims it to be #Person1#'s. #Person2# returns the watch.
documents: #Person1#: Is this watch yours? 
  #Person2#: No, it isn't mine. I blundered upon it under the sofa. Do you know whose watch it is? 
  #Person1#: Let me have a look. It's mine. I have been looking for it, but just cannot find it. It's present from my father. 
  #Person2#: Well, here you are. Remember to put it in a proper place.