If he was guilty he certainly would have done and much more to look after his interests, but then our whole political system ius a circus and even judiciary is unable to cope with the kind of corrupt minds that are there in politics..
In any case, wherever CBI is involved, it seizes the important related documents for the sake of proving the case in the court. In this case of Dayanidhi maran, whether CBI has taken away the documents or not known even today.
This is a question of facts and not thoughts. Only Maran knows whether any documents were taken out. C.B.I. alone may suspect this. Nobody else can answer as he is not connected with inquiry.