I am looking at an M&P 4" in excellent condition with the serial number C 3077XX. Four faint old looking numbers written in ?crayon? on the bottom of the "gold" box do not appear to match the serial number. What years was the gold box used as the factory container for the S&W M&P? Where were serial numbers placed on the box before the modern end labels with brl. length, finish, caliber, etc. with which most of us are familiar. Thanks.