My local dealer who is also a pawn shop as well as a dealer for all major brands only opens transfers when the customer is there. This is to avoid any of the questions you are asking.

The customer sees what comes out of the box and what condition. Been this way for over twenty years.

You are not required to take transfer of the firearm if it is not what you bought or if there is a condition problem unless it was a auction which stated otherwise.

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Still Running Against the Wind