op,
I used to live in NJ (now a resident of Texas).
A fellow traveling straight from VA
through NJ to a Moose hunt in Maine. He got stopped by NJ DPS. They did not honor the Federal Firearm owners protection act of 1986.
He was arrested and spent the night in jail. The DA dropped the charges the next morning.
BUT NJ DPS refused to release his rifles because they claimed his journey had been interupted, and no longer was covered under the 'continous journey' clause of the 1986 act! The fact that the interuption was involuntary, not his fault and
caused by NJ DPS didn't matter to them.
It cost him $5000.00 in legal fees and took many months to get his rifles back. Ultimetly, he had to arange for an FFL holder in NJ to pick up the rifles and ship them to an FFL in VA.
Just borrow a shotgun that is already on-site to hunt with your relations. Tt sucks, but, ya know...