We just registered our new 21 last Friday at a California DMV office in San Jose. We also asked AAA about registering our new Escape before we even brought it home but they said they couldn't register a new vehicle because the DMV has to "verify" the vehicle before it can be registered. Sure enough, when I went to the DMV office with all of the documentation I received at delivery, including Customs docs., the first thing that happened was a walk out to the trailer accompanied by a DMV manager, who verified the VIN on the trailer matched the VIN on the paperwork. Then I was allowed into the line for appointments. After about a two minute wait I paid the use tax (OUCH) and completed the registration in very short order.
So lesson learned: do your homework on the DMV website before you go, make an appointment, and ask for a new vehicle VIN verification when you first arrive.
Probably not much help to people in MA though. Hang in there
and good luck!!