States want their pound of flesh. If you have residence in OR and don't have the boat registered with some other state they will have a case that the boat should be registered there.
If you fly low and don't arouse interest you can get away with the issue not being brought up by them.
If they take an interest in you you may have grounds to argue otherwise and may even be correct. But the argument will cost you in time, aggravation, money
and potentially sailing seasons if you are required to appear to argue at times that you would like to be moving the boat through or out of hurricane
areas. If they prevail you will be on the hook for back registration
My recollection of specifics is that documentation
allows you to skip placing the required state registration
number on the bow but does not get you off the hook for the money
. Long ago recollection so don't take it for anything like gospel.