The sticker in the boot is a VW thing, it's not G40 specific. However the codes on there should be the original codes of everything installed on the car (ie. chassis no, engine no, paint code, extra trim/ add-on codes) So it should say PY for the engine. You can normally visit a dealers and request the previous history from it too although it sometimes means having to go to the dealership it was sold from as not all the info is on the network and is occasionally held locally (was when I worked there anyway).