The Puzzle of the Empty Tomb:
Resurrection was at the heart of the message of the early church. The resurrection of Jesus Christ was the ground of the message. All that had to happen was the body of Jesus be produced, and Christianity would be rubbished and completely undermined. Even just to show that the tomb had been tampered with or to check the guards on duty.
The empty tomb is presumed on in the preaching of the early church, and was not questioned as all knew it was empty – this was verifiable and undisputed at the time. Much of the preaching of the gospel in Jerusalem was done in walking distance of the empty tomb!