I think to keep it simple is if it's a US address then that's what it is. Just don't advertise that you are in Canada and having it shipped to the US for pick up, I would think IMHO. Not that I would encourage people t do that, but if I was going to be in the US from Canada for what ever reason and I don't want my package left at home while I was away, then ship it to where your going to be at in the US I guess.

It's good business ethics to respect your counter partners sales boundaries.