Volkswagen India — Need a duplicate copy of my car invoice

I draft this mail for a request for a duplicate invoice copy of my vw vento, 2011 model 1.6 l petrol highline car.
I actually require my car to be re registered to goa from mumbai. I have taken the noc from mumbai. Goa RTO is now ask for the invoice of the car to analyse the then price of the car to prepare the tax amount here. And to my bad luck i have miss placed it.
My request is, can i receive a copy of my invoice or a letter stating the then price of my car.
Please help me.