Someone stole the body!

[Jehanne]

I don't consider the story of the empty tomb to be an ironclad fact of history, in the same category as Caesar crossing the Rubicon.  

Thank you! It certainly isn't. Apologists love to reply that there are "so many early documents" that attest to the empty tomb, but the fact that people copied some religious propaganda frequently doesn't establish the historical veracity of any of it.

No, there are no early documents, basically, Paul and Q (neither of whom mention any miracles of Jesus nor the idea that he was the "incarnate God") and Mark, so there are three quasi-reliable sources at most, which are, themselves, theological works and not disinterested, dispassionate sources of history; they all have theological axes to grind.  Contrast this with the Jewish historian Josephus who mentions triviality after triviality in the 1st century but ignores Jesus completely, the fraudulent insertion not withstanding.