Belief that Jesus resurrected flourished in AD 30-40 Jerusalem; Jews converted in droves.1 This is relevant because Jews would hardly believe this if critics showed everyone that Jesus's body remained in the tomb.2
But wait, maybe Christians were only saying Jesus resurrected non-physically. (So showing his corpse wouldn't stop belief).
But so what? Maybe those Jews were lying (to allow for creative counter-arguments against “the empty tomb proves He rose”)?2
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.]
In Jerusalem, Jewish opponents were not arguing that “We showed visually that Jesus's body is still here.”1 This is relevant because the Jews would have inevitably desired to broadcast news of their exhuming or otherwise exhibiting Jesus's corpse, if it was ever done.2