Ehh, I don't know I was just searching Dateline (NBC) and 48 Hours (CBS) but couldn't find the video I saw....
I believe it was a Dateline story, it was on later in the hour. Harry checked his dads house, it was in good shape, pretty dry...a nighbor told him about an old guy layed out on his porch, Harry and the boat went and got the guy (who was in his 80's) and brought him out.
The shot where I saw the M4(gery)...the boat was like a bass fishing boat, with a broad blunt bow, there was a platform on the bow set below the gunwales...he was sitting on the first seat back from that....the M4 was either on the platform or near his feet...I just remember thinking...what the hell is that, it looks like a Beta mag...sure enough it was, attached to a carbine length AR, in another shot you could see the M4 stock. Conick was the closest person to the weapon, none of the cops were visible, it seemed to be located where only Conick could grab it...
First thought was wow...second was, I bet Sean Penn didn't have one of those on his boat....
Maybe someone can find some screen caps or video....