You don't understand how this will work.
First they will "get rid of the gunshow loophole". That is Brady-speak for no more face to face private sales. All guns would have to go through FFL's. There would be a "registration" of all guns.
In addition, as has been proposed in many states, any gun that is discovered to be lost, missing, or stolen would have to be reported within 24 hrs (or some other short time limit). So, you can't just say, "Oh, I lost them in a tragic boating accident." The "authorities" would have to have a report on it from you, or you would go to jail for failure to report it.
So, they gotcha both ways.
Also, to make sure you don't "bury" or hide them, they will have mandatory safekeeping of firearms... a licensed safe, which they can inspect at any time, and make sure all the guns registered to you are in that safe. Or as has been done in Europe, guns must be kept at a club armory, not in your home. During WWII when the Nazis invaded Norway they simply took control of the club armories first. That law was pushed through by the prime minister (or whatever the elected leader is called there) John Quisling, who was secretly a Nazi. He did that to prepare the way for the Nazis to invade. To this day being a "Quisling" is as bad as being a "Benedict Arnold".