The most plausible explanation is that it is a made-up story, like the apple of discord in Greek mythology.
I guess you should have been around between 34 AD and later; to WARN those fooled people who DIED, many by quite HORRIBLE deaths, for the Message that they had been told.
(You might want to check with some of your co-workers, in the History department, for independent reports.)
But an explanation is implausible if it opposes established historical truth.
That Christ’s tomb was found to be empty within days of his crucifixion and death is accepted as true by mainstream historians.