Have a bit more hope Kraxis, after all the Oxyrhynchus Papyri are also the only source for the Oxyrhynchus Historian (very likely Kratippos of Athens). If the dump has his sober history of the early 4th century, why not other quality historians as well.
Even tragedy and comedy can be useful historical sources, the Persians by Aeschylus is as valuable as Herodotus when it comes to the battle of Salamis.
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