I have been traveling across the Canadian Border with Firearms since the late 70's. Never knew anything about 4457 until about 8 years ago. Took a firearm to the CBP at my local airport with the form filled out and they didn't look at the firearm. Came back to the US with the 4457 in the rifle case the guy asks me for the 4457 I said its in the case with the rifle He says its supposed to be in your possession. I said whats the point of having it in my possession if you can't see my possession he said welcome home. Since then I have had the 4457 in my possession and showed it to them every time. No one from the CBP has ever seen either of the firearms I have 4457's for.
The form makes very little sense to me unless your firearm gets stolen while abroad or something.
Rant over lets go hunting good luck and shoot straight y'all
