I agree that most cases around are not like real interview cases.
However, you only look at one part of the equation, which is the documented version of the case. What makes even more of a difference than the case is the professionalism of your interviewer.
Consequently I'd say don't worry too much about the specific case as long as you develop your skill to solving cases consistently well (i.e. mastering the process of solving cases and not the one specific case) and you have strong interviewers teaching you the right mental skillset to be successful in case interviews!
Hope that helps - if so, please be so kind and give it a thumbs-up with the green upvote button below!