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To answer your question, the Damp-proofing membrane have to cover all of the underside of the slab, up to your finish soil level. You can't retro-fit and comply with the code. On the bright side, no one will make an issue of this, just because it not there. Its the huge cost to fix a "may be...

NCC-2011 (National Construction Code) NSW 3.2.2.6 Damp-proofing membrane A damp-proofing membrane must be installed under slab-on-ground construction for all Class 1 buildings and for Class 10 buildings where the slab is continuous with the slab of a Class 1 building as follows— (a)...