I'd just take it as a lesson and no deal with him again. What did the sales tax come out to? $30-60? How many hours of your life and how much frustration will you put up with for that?
Everyone seems to be asking this question. Is it that unthinkable that the seller included a receipt in the box? I believe most of my used guns have come with one.I'd like to know how he knew the price to charge tax against? As the recieving FFL, he had no reason to know.