@omeriqbal83 and all
Sorry I didnt post this earlier. I would have but was pretty tense as Karachi city has been under fire (again) with violence everywhere and didnt get a change to visit PW.
So yeah, I checked the 2 serial number plates when I got off from work. Yeah, there are 2 of them apparently. The one thats behind the air-filter has the engine number details etc, while the other one has the chassis number and the serial numbers for the 2 CNG cylinders (if your car is FF CNG from Dewan). It also has the CNG cylinder capacity (54L) and also the last date the cylinders were tested. Neat, and well, I guess its time for me to get my cylinders checked