Well good news...it's not so bad. I'm applying for Collector registration here in NJ. The state needs a letter certifying the car as "rare" from a club or the manufacturer.
Well, I sent a request to Pontiac via their website last night, and have already received an answer (go figure? that was quick)
According to the very nice woman on the phone, all they need is the VIN and the current mileage. They will send you a letter of authenticity stating the vehicle is out of production and was limited.
The number she supplied me with is: 1-866-790-5700 ext. 22864
It takes a few days to mail out...but overall, that was easy.
Good luck!