This is intriguing, to say the least:
According to a report in the Egyptian daily Al-Ahram, by Wajih Al-Saqqar, archeologists have discovered ancient Egyptian coins bearing the name and image of the Biblical Joseph.
Source: MEMRI: Latest News.
But I don’t know what to make of it, except I can’t accept the Koran as proof that Egypt used coinage in Joseph’s time. If this is for real, though, and if it can be verified by proper archaeological means, I expect we’ll hear more about it.