The label on the box should have a Product Code number (I presume the box is original to the gun). Do any of the following numbers show up?
103499, 103494, 103504, 103505, 103506, 103507, 103508, 103514, 103515, 103516, 103526, 103535, 103536, 103537, 103542, 103543, 103545, 103592
Remenber these are Product Codes, not serial numbers. In any case some Product Code should be on the label.