I wish they do tell us the actual mark as well, but as far as I know there is no easy path to obtaining official marks other than the grade in the transcript.
I suppose you can approach the lecturers individually and ask them for signed letters detailing achievements in each subjects, though I don't think many academics would be inclined to do that.
But since most transfer and postgraduate application only look at GPA (for this precise reason as CSU and some other universities provide only grade), it should not really affect your chances of any future application you may make to study at a university.