Apply for a Curio and Relics License (FFL03). May take some time to get, but then you never have to worry about it. (At least until you need to renew). I keep a copy in my glove compartment along with my COE just in case I need to make an emergency
You think you know, but you have no idea.
The information posted here is not legal advice. If you seek legal advice hire an attorney who is familiar with all the facts of your case.