Someone I know used to ride his bicycle to school everyday by a house that had a large shed out in field that was visible from the road as he passed. There was nothing exceptional about that shed that would lead one to believe it held something extraordinary.
Twenty some years later he followed an ad in a paper to that same house and discovered, in that shed, a very rare model of automobile built in the 1930s. It had been parked there for decades, dust ladden, and none of the neighbors knew about it.
Someday, someone is going to find a nuke, dust covered and forgotten, in some shed.
You just watch.
Yea, hiding it might not be too difficult. Maintaining it in working order over such a long period would be. Plus, I can’t factor a reason to go through all the risk of bringing a nuke into the country just to sit on it for a decade. If you are motivated to bring it here, you are motivated enough to use it when you bring it.