In another forum where members discuss other types of guns, I posted the complete serial number of a gun that I own and that I was seeking information about.  Members of that forum warned me not to do that, because someone could take down the complete information about my gun, including the serial number, and then report it as stolen from them, getting me in trouble.  That seems pretty far fetched to me.  How would they know who I really am?  Is that a valid concern?