Jews and other critics of Christianity in AD 30 Jerusalem never visually demonstrated that Jesus's body was still in its tomb.
But so what? Couldn't it simply be that…
• …they couldn't locate Jesus's grave?”2
• …they couldn't prove the (decomposed) corpse was Jesus's?3
Mary visited Jesus's tomb and found that it was empty.
In AD 30, the public stance of the Jerusalem Jews was that, “Yes, Jesus's body is gone from its tomb”, crying “theft!”.
• …Matthew 28 says they did
• …Those Jews were saying it in AD 70
But so what? Plausibly…
• Maurice Casey (NT professor at Nottingham): “Some Jews who heard the story of Jesus' bodily Resurrection from an empty tomb will have found the story absolutely unconvincing and they responded with a story of their own, one which reflects their absolute and understandable mistrust of Christians. …it will have been made up far away from Israel some time after Jesus' death and burial,…”. [Jesus of Nazareth (T & T Clark, 2010), 478.]
Whoever started the claim that “Jesus's body is gone from it's tomb” was not telling a apologetics-motivated lie.
But so what? Perhaps it was Mary; she mistook an empty tomb for Jesus's?
Christians in AD 30 [were not saying that Jesus's body was gone from its tomb. [Full article.] This is relevant because Christians would have known if Jesus's tomb was empty, and they would have reported it.
After being crucified, Jesus's body was in fact not transferred to a tomb. [Full article.]