Well, I've never heard of it. What kind of information would the press have regarding the uncle that the police need to see?
Deej they want to see how the guy ticks ......is why they want the videos.....how he interacts with people.
I think they want all comments and statements the uncle made. Perhaps to compare them and look for discrepancies or 'odd; comments/behavior. Videos, to look at body language. The media would have most if not all such interviews whether newspaper, tv, radio or in person.
Kind of like when a diligent FReeper gathers all threads on a topic to archive. The media would have a vast collection all in one spot.