What you can't seem to see is that the law was broke, long before the gentleman knew he broke it, by the simple act of possession inside his house! Taking the firearm to another State (only 10 minutes down the road), entails no more risk than keeping it.
Now, the rifle is on consignment in a State that is lawful for possession and the sale.
No harm. No foul.
STA: We are not advocating that the gentleman break the law. We are using facts that the law was already, if inadvertently, broken and merely recommending perfectly acceptable procedures to save the firearm short of a melt-down.