isaac delatorre faked his business studies case study and still got 95 as his final mark. Although it is very risky if you are skilled enough to convince the marker that it is true and that it is not obvious that you faked the case study than maybe you get away with it? But I think luck could have a factor since markers have literally thousands of papers to mark so they are probably mentally tired and won't even bother... heck I even check NESA's booklet for english and the exemplar actual band 6 response have students making up quotes on the spot or inaccurate quoting but still get full marks (heck even some of the related texts don't even exist but sounds legitimate enough)... I am not encouraging you to do this of course but you get my point..
For business studies I think to an extent its actually alright to fake case studies by using 'hypothetical' businesses to illustrate your point, but in legal studies, cases play a much larger role as you're using it to criticise the effectiveness of the law, and thus tbh unless it's an EXTREME situation I really wouldn't.
But you're right about the latter, I've read exemplar legal band 6 essays from the NESA book and people have had the wrong years for legislation and mixed up cases, yet these are the published responses in NESA's OWN book.