If it was done then I imagine the invoice/receipt included would say it. As I say it often gets neglected, so I doubt the dealer that sold it would have bothered, and would likely have opted for basic service.
I would avoid driving it far without sorting it out, but a short journey *might* be okay.
If you can't find any history of a DSG service, and the car is on more than 40k mile, I recommend taking it to a VAG specialist to have the DSG serviced ASAP