Hi curious, I can understand how you reach your conclusion. It just depends whether they were 'mistakes' by a guilty Jeremy or the innocent behaviour of a young man in a state of shock???
In my opinion if one is in a state of shock there would not really be any need or desire to buy every newspaper in the days that followed, discuss the wearing of make up in order to whiten ones appearance for a funeral or any need to set the video recorder to record the news coverage of the funerals.
Such a thirst for news coverage would probably fuel symptoms of shock possibly making such a shock worse.
I also think breaking into an empty house, where a murder had recently taken place, through a window which gives an appearance of being untouched, in order to get some car documents is stretching the explanation of shock as a cause of behavior.
Why not just innocently go to the house during the day whilst 'in shock' and then ask for required documents?