Here's some information I received when I managed to contact customer service by phone:
The "lost" cars does not refer to cars that were lost, but to orders that were lost. Some of the September, October, and early November orders were lost due to a computer glitch. This led to VINs not being assigned, and to January orders being filled before those early orders. I was told that Nissan is on top of this issue now, and this is why dealer demo cars are being re-assigned to individual buyers whose requested configuration matches a dealer demo car. I was also told that this might explain why my owner's portal allowed me to register one VIN, while CS has a different VIN listed for me, though she could not tell which VIN was actually my car. She said she'd send the info to a "team leader" who has access to more information and who would try to figure out where my car really is and when it will arrive, and then get back to me.
This is the most information I've ever been able to get from CS.
CAVEAT: If the above is correct (and she sounded very confident, and knowledgeable) it would be the first correct information I've gotten from the CS line. Knock on wood.
The reference to a computer glitch screwing up so many orders reinforces my opinion that Nissan hired Microsoft to design their software.
Reserved afternoon of 4/20.
"You can order" email late September, but was out of the country so...
Ordered very early October.
Dashboard says: more of the usual worthless Nissan b.s.
(Not on spreadsheet cuz I can't figure it out.)