I accept your viewing bible as a flawed book means you cannot accept it as the inspired infallable word it is to me saying Egypt is prophesied biblically to be desolate for 40 years and this backs up the dates involved but not secularily which has no findings on this you will dismiss it.
Reniaa, even if one was to view the Bible as the 'inspired infallible word' of God, one would run into problems of how to interpret this passage due to the lack of biblical and secular evidence to enlighten us. The problem is compounded by having an overly-literalistic approach to interpreting prophecy like you, 3W and others have. For instance,
Who was the Pharaoh abandoned to the wilderness and given for food to the animals, i.e. killed (Ezek. 29:5)?
When was Egypt left without a chieftain (30:13)?
Likewise, with Jeremiah's prophecies (ch. 51) about Babylon's fall where God was going to bring about such a cataclysm upon the city at the hands of the Medes, that the land would be empty, without inhabitant, the city would be ruined (vs. 2, 11, 26-29) and where God's people would have to flee for their lives (v.6). We know the land wasn't emptied and laid desolate by the Medes (Babylon's demise took centuries). Neither did God's people have to flee for the lives. They left Babylon in a peaceful, orderly fashion with the blessing of the new Persian king. Leolaia's already mentioned Tyre - that's another one.
Those are the kinds of difficulties you run into when insisting on literalistic fulfillments. It's all very nice trotting out the line about believing in God's inspired, infallible word, but believing the Bible isn't the issue here. The issue is how to understand the writers' intent, use of language (e.g. is it 'artistic poetic rhetoric' [C.J.H. Wright]?), the political, cultural climate of the time, and being open to other possibilities as to how the prophecy may have been fulfilled rather than wanting to squeeze them into our preconceived ideas.
To give another angle on the 40 years, see this old Bible commentary http://www.ccel.org/ccel/cook_fc/provez.i.vii.xxix.html and scroll down to the footnotes on pp. 372, 373. I don't think there have been any new discoveries since 1876 that would negate the information there and BM 33041 about Neb's campaign against Amasis in Neb's 37th year or 568 BCE doesn't shed any more light on fulfillment.