I have a 2004 Sailfish - It is the model that has the sstern seat - The seat top lifts up and you have access to an area where the batteries and pumps are - On The inside hull wall I just applied stick on numbers that are generally used to put registration numbers on state registered boat - To make them permanent which is required I just put a couple of coats of clear resin over them and they are there to stay - The few times I have been boarded I have never been asked by anyone to see them - they just wanted the documentation papers
Good Luck