I've got to agree with the "They don't care" idea. When you go to Canada, you know exactly what to do. Pull into a marina and there signs with the customs phone # and often times a dedicated phone just for calling them. It's very clear even to somone going there for the first time. I've researched what you are supposed to do when you come back to the US many times and still don't really know. It started to make some sense when they came out with the I-68's, but if they are suspending it, who knows what to do?? I personally don't do anything when I come back, I guess out of ignorance but not for lack of trying. With the internet and all of the homeland security business, it's ridiculous that it remains such a mystery.