timf,That would have been 0001EX, not 000001. Although in reality it probably didn't have an official VIN because Rivian only applied for their WMI within the past year.
I think you're right. The one vehicle I checked in Normal (the Launch Green one pictured here) had the EX suffix in the VIN. I'm assuming every vehicle that rolls anywhere must have a VIN, even if headed right from the assembly line to crash-testing. Those earlier Long Way Up models were pre-production, so unless there's another suffix available, those were probably branded with the "EX", as well.
It breaks my heart that this R1T will likely never get to see the highways and byways around the country.