Even if the numbers were 6000 or 600 there isn't any evidence for that either. There isn't any evidence for any large number of jews being held in slavery at any point in the history of Egypt. It's excusable that a lone prophet wandering insignificant parts of the Roman empire wouldn't have primary sources that survived to this day, but totally unrealistic that no sources or even archeological evidence exists for thousands of people supposedly held in captivity.
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