If you go the route that Longrifle advises, I'd get it in writing with a real person's signature. Often government agencies disagree with one another, and often, the left hand does not know what the right hand is doing. For example, I carry a print out of the laws pertaining to transporting firearms, issued by the Chief Firearm's Officer of BC, in my truck at all times. Then when I am stopped, in a routine check for example, by a game warden, or a young inexperienced police person who thinks I'm in violation and wants to seize my stuff, I can show them the law. It's never happened to me personally, but I know of instances when carrying the information would have saved a lot of grief.
So to recap, get it in writing, and know the law yourself.