Hi Amelia.

I just found it an hour or two back - thanks for trying anyway.

So: It's not a Stele after all - it's part of a panel from the curtain canopy of the room furniture found from the burial of Heterphes, wife of Sneferu, reburied at the bottom of a deep shaft east of Khufu's Great Pyramid in 1925-1927.

It's from Lehner's The Complete Pyramids page 117 - I didn't think to look at pages on the Giza pyramids for a 'Stele' of Sneferu frankly!

Dave Light.