vjanelle
Contributor
I think taking the valves off is overkill and hopefully it won't come down to that in the future. When I lived in Ontario I'd occasionally buy equipment in Detroit. One such visit yielded two faber LP85s. I was out of room in my car so I put them on the front seat, strapped in with the seatbelt. I sure got some strange looks from the customs agent.
Customs *might* ask you to be able to open them up to make sure there's nothing inside. Or they might just shake it a bit.
The serial # thing I'd suggest though (unless they don't have TC stamps, then it's really obvious they didn't come from here).