It isn't evidence of anything, save that it held the bones of someone named Shimon bar Yonah.
am not mistake, the first evidence of "spikes" in a crucifiction came from an ossuary.
And that proves what, exactly? That people who were crucified were buried just like other people who died?
By your logic, if someone found an ossuary marked "Yeshua bar Yosef," that would disprove the resurrection. After all, it has Jesus' name on it, and we know that some crucified people were buried in ossuaries ... QED.