Given that 99% of excavations don't turn up anything of significance, were these artifacts already known to have existed and were just "discovered" on the show

Given that 99% of excavations don't turn up anything of significance, were these artifacts already known to have existed and were just "discovered" on the show as the reveal? I'm truly not trying to create conspiracy theories, it's just the coincidence of this being found on a tv show seems unbelievable lucky.