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>> “John never went to Egypt, yet more fragments were found there than any place else.” <<
Try not to forget that the place where the gospels were written was sacked by Rome in 68 AD. Little can be found of parchments or Papiri after a city is burned and smashed.
The most complete copies of the NT writings were found in Spain, far from their origin.
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Climate plays a big role in this, too. Egypt and Spain have much milder climates than the harsh deserts of the Levant. This is why we have a more complete picture of ancient Egypt than Mesopotamia from the same time.
An interesting fact on that note: we have so many ancient papyri, monuments, statues, artifacts, etc. on Egypt that we actually know more about it than we do Medieval Europe, even though it's obviously much further back in time...in fact, it's not even close.