Don't call your attorney general

You actually owe that sales tax even if it is not collected by the vendor. For example where I'm close to NH, a lot of people jump over and buy items in tax free NH. Technically, they owe that sales tax to MA, even though it was not collected by the NH establishment. So sadly by not collecting it and you not claiming it you are in violation of the law. Wouldn't be a good idea to call the AG and admit that...