Always verify the legitimacy of individuals or organizations before sharing personal info or making payments. Do your research. RSA is not responsible for losses or damages caused by scams or fraudulent activity.
The 40-X comes out of the custom shop. You could order what you wanted. If the barrel doesn't have a Remington proof mark on it, it is a replacement. That doesn't give you the date you wanted but gives an idea of what to look for. Hope someone else has more information.