Hi Mate, I am not up on the process of how laws are drafted 100% but presume there would have been consultations / discussions etc. and from a recent film I saw about Parliament, every thing is recorded kept and stored.
I suppose it is a combination of where to look and if accessible to researchers / digitised or dusty boxes buried , It should be stored somewhere I would imagine, so the answer is out there (as they say in that TV series)
ATB, ED