 How do we know that Matthew is an accurate reporter of the facts that he supposedly witnessed? First of all, you explore his document that he wrote carefully, checking such things as Greek manuscripts, checking such things as internal consistency, checking such things as archaeological support of the place names listed in the document. Of the place names? You go to other documents. Archaeological evidence of the place names is corroborating evidence? Yes. So is the existence of New York corroborating evidence for Spider-Man?