Grain silos were the Hall mark of Joseph.
The only lasting evidence of Joseph in Egypt that one might expect to have survived the last 4000 years are the grain silos that were cut into the ground in key Egyptian cities.
Grain silos date back to the Third dynasty and were utilized extensively in the Djoser Complex designed by Imhotep. In fact, the Step Pyramid seems to have been built on top of a shaft that could originally have been used to store grain. The complex seems to be a grain storage and distribution center. When Djoser (Netjerikhet) died, he was entombed in this protypical grain silo and a series of Mastabas were build on top resulting in the Step Pyramid.
The Famine Stele not only confirms that Djoser and Netjerikhet were the same person, it confirms that Djoser was a hereditary Land Lord and left the land to the Priests. The Famine Stele tells the story of how Imhotep came to Djoser in his 18th year and interpreted his dream. It records how Imhotep saved Egypt from a seven year famine.
These archaeological findings and historical records are strong evidence that Joseph and Imhotep were the same person.
The problem remains how to account for the discrepancy in chronological timeline if the Israelites were in Egypt 430 years and the Exodus took place in the 13th dynasty.