The VIN is on a tag under back seat. Here in CA you can call DMV to check status. I have heard there is another VIN in spare tire well but have never seen it. What are you needing to check? Title matching VIN or no title and looking for possible back fees?
Hum, not sure but you could try adding leading zeros to fill in the blanks ahead of your older vin. I ran into this once before where older cars are not in the system.
If all fails, you could ask your nearby VW dealership to look it up, They should not charge for that since you are a potential customer for parts and service. I know my local one helps out when I need paint codes or other such for older cars.