From what I can tell, a Swiss/Egyptian team found it in a satellite structure at Abu Rawash in 2002 and was "rediscovered" by Zahi who rummaged around the museum's basement looking for pieces to display at an exhibit, according to Zahi in this book: [www.amazon.com]
What's even more fascinating is a quote from this page: [www.guardians.net] as follows:
No prior documentation of the Khufu name on this piece? No mention of nesu-biti, Son or Re, or any other form; only the Horus name? Is the description a mistake? Horus Names are only found in the "serekh" cartouche, not a royal oval cartouche. His Horus Name is indeed there but it is not in a serekh.Quote
From Abou Rawash, is a large alabaster bowl chosen for the exhibition. While cleaning around the pyramid located at the site, a Swiss and Egyptian team discovered the substructure of a satellite pyramid. This small substructure held only two rooms but surprisingly there was a wonderfully made bowl. Inside the alabaster is inscribed with the Horus name of Khufu in a cartouche. The inscription can be seen only with use of a light against the transparent material. This bowl had been in the museum basement for a while, and when I brought my friend Dr. Ali Radwan to examine some of the artifacts we discovered this cartouche. Ken Garrett was able to photograph our looks of surprise and pleasure at the discovery.
Forgive me, but I ALWAYS get skeptical when things get muddy like this. Somehow I wish Zahi's name hadn't come up in the context of this piece.
Post Edited (09-Sep-14 06:09)
How can any of us ever know, when all we can do is think?