France has seized rare antique cars in the United States for no other reason than they can manipulate the courts and the cars are worth a lot of money. If you find a treasure chest of gold or a rare and famous what-have-you. Dispose (sell) it quietly.
Remember the greatest idiots of all time who found they had 10 1933 St Gaudens double eagles and sent them ALL into the Treasury to ask if they were real?
America is truly creating a bumper crop of dumbasses these days...