Welcome.
Nice choice of car I'm sure you'll enjoy it heaps.
In regards to your questions:
Finding out the number will be difficult. Your best bet is to contact VW Australia customer service through their website. I wouldn't be holding your breath though as I tried contacting them several times before I even got a response.
Rear view mirror is an auto dimming setup so it is has a funny tint to it normally and even more so if you're rear window is tinted. It almost looks green at night in mine when lights are shined into it. Also my stock side mirrors were non tinted stock. The blue tint you refer to is the European setup. I now have a blue tinted aspherical setup on both sides which helps see the blind spot.
As for the extended warranty I bought mine when it was just out of warranty nearly two years ago. Aside from a reverse light switch ($20 and less than half an hour labour) nothing has gone wrong. The likes of Volkspower etc are more than likely going to know more about the car anyway than the VW dealers as most of the cars I know of now are all serviced by the specialised dealers.
As long as the car has had a full service history with all services done on time then the car shouldn't have any issues.
Finally depending on how you drive the car every servicing it every 15000kms will be fine but an oil change and check up every 7500kms never hurts.
Enjoy.
Cheers,
Trent
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