If I understand the question my answer would be they (the Gov. or local authority) Will get my wepons when they come to the door and ask for them. BUT they won't get all of my wepons, there are some they know about and some they don't and not all are at my house.
With a law like you are talking about, all you are going to do is to Make a lot of armed criminals. California tryed to make a gun law stick and they have a bunch of armed criminals walking around right now.