I have to confess that the whole business of Jesus' lost tomb left me very underwhelmed. It seemed to highlight more the desperation of people at Easter time to unearth the next lot of "conclusive" evidence to disprove Jesus.
Dr. Ben Witherington has done some excellent work in explaining the Lost Tomb story and it's refutation in layman's terms. Here is a link to an interview that he did on UK Christian Radio. (Scroll down slightly to "A response to the Lost Tomb of Jesus").