I would think they want to see the boat to determine premeditation. (i.e. could this boat reasonably be used for fishing in the bay). The boat is one of the premed factors.
I have to believe that they all know he did it it's just a matter of premed or not.
We'll see if they start asking about other premed factors....Maybe the "my wife is lost" testimony on the phone with Amber.
Yes, okay I see how the boat can mean that! Good.