So, you are left with exercising good judgement, whether a report is true, half-true or false. And you have to allow for the benefit of the doubt. Take for example Josephus' testimony on Daniel. Do you accept it as fact or fiction:
Josephus (ca. 100 CE) would view Daniel as “one of the greatest prophets,” because not only did he prophesy future things, but he also fixed the time during which these would come to pass. He viewed the third kingdom of Dan. 2 as Greece, “from the west,” intimating that the fourth would be Rome. He was also of the opinion that the book of Daniel was in existence prior to the arrival of Alexander the Great in the fourth century BCE. Elsewhere Josephus interprets the actions of Antiochus IV Epiphanes as being the fulfillment of prophecies made by Daniel in the 6th century BCE. He also tells of a tower that Daniel had built at the height of his fame, at Ecbatana or Susa (according to Jerome’s copy) that became the burial place of kings. This structure was still in existence in his day, so his detractors could go and see it.