Someone stole the body!

[Jehanne]

I think that he was buried in a tomb because of his very quick trial and execution.  Some Jewish authorities may have felt that Jesus was condemned unjustly; after all, he was just another loon walking around have delusions of grandeur; there were, after all, hundreds of these types of individuals on the scene during the 1st century.  Maybe some Jewish authorities heard complaints about this, and with the attitude that "Hey, we're all going to die someday anyway," decided to convince the Romans to hand Jesus' body over to his relatives, as the preservation of the corpse was important to Jews of that day, as well as ours.