It is true, that most archaeologists have found no evidence that the Hebrews were a significant presence in Egypt.  Recent critics of those scholars maintain that they were working in the wrong time frame.  The revisionists have developed a "New Chronology" which brings the biblical accounts forward by several hundred years. Proponents of the New Chronology maintain that this new timeline removes the basis for skepticism concerning the Hebrews in Egypt and their subsequent Exodus.  Naturally, the academic establishment has pushed back.  Until there is unequivocal proof that the Hebrews were not in Egypt, I choose to accept the Biblical account of Joseph, Moses and the flight from Egypt.