Not wanting to go (any further) into debates over the historicity of the resurrection (or indeed the James Ossuary) but an interview
with Ben Witherington III has been noted and it makes this comment about the James Ossuary:
...but let me say why this is such an important issue. The James Ossuary is an indirect testimony to the resurrection of Jesus. The reason I say that is you don't brag about being related to Jesus if the last thing that happened to him was that he died on a cross – that was the most shocking way to die in antiquity. So the fact that this ossuary reads, "Jesus the son of Joseph, his brother is Jesus" is very clear that this person is claiming to be related to Jesus and he wouldn't be claiming that if Jesus died on the cross and there was no resurrection.
To cut and paste what I've said elsewhere, I would have thought that all this line of thought could possibly prove is that people believed
Jesus was resurrected. But then we know that anyway. If we take Witherington's logic one step further, the earliest Christian literature would not be making such claims about if there was no resurrection, right? If I am being fair, then that would be some leap of logic.