I remember watching a Discovery-type show on Joseph of the Bible. They found a tomb down in a Jewish section/town in Egypt with a mosaic of a guy with red hair (how the Egyptians portrayed Jews) and the man was wearing a colorful robe (also Jewish - and perhaps a play on “Joseph’s coat of many colors” when he was a young man).
The figure also wears a ring with the King’s seal (or whatever it was) - and indicating that the person was of high rank. No bones were found - although they said when a tomb was sacked all the good stuff is taken - but the theives don’t take the bones. (Joseph’s bones were taken out in the Exodus).
And - up in the mountains (near the tomb I think) there is a place called “Joseph’s Dam” (or something) from the translation. They think prehaps it was built on the orders of Josepth for the impending 7-year drought. (I tried to search this on-line just now but couldn’t come up with anything).
Try entering the name David Rohl into your next online search. Also Avaris or Bahr Yusuf. Those are Rohl’s theories you mentioned. I got to meet him at a seminar in January 2004.