Inside the aforementioned RPGA dice bag I purchased was this die.  It has all the hallmarks of a first generation Zocchihedron, but is a kind of translucent silver rather than opaque white.  It appears to match specimens that have been offered for auction as "test batch" Zocchihedrons. Can anyone with more expertise than I have confirm this?  Kevin Cook concurs that it's a first gen, but he doesn't have a "test batch" specimen in his database as of yet.

https://photos.app.goo.gl/znqHoJAEziLhn2SF8