Finding case studies that illustrate philosophical concepts in Paper I can be a challenging task. However, there are several resources that can help you in your search. Here are some recommendations:

1. Academic Journals:
- Academic journals such as the Journal of Philosophy, Philosophical Studies, and Philosophy and Phenomenological Research often publish case studies that explore philosophical concepts in depth.
- These journals can be accessed through academic databases like JSTOR, which is commonly available through educational institutions.

2. University Libraries:
- University libraries often have extensive collections of philosophical texts and case studies.
- You can search for relevant books, articles, or dissertations that provide case studies on specific philosophical concepts.
- Online library catalogs like WorldCat can help you locate resources in various university libraries.

3. Online Philosophy Forums and Communities:
- Online philosophy forums and communities like Reddit's /r/philosophy or philosophy.stackexchange.com can be valuable resources for finding case studies.
- Users often share and discuss specific philosophical concepts, providing case studies as examples.
- Be sure to critically evaluate the information shared on these platforms, as they may not always be peer-reviewed or academically rigorous.

4. PhilPapers:
- PhilPapers is an online research hub for philosophy, providing access to a vast collection of articles, books, and papers.
- It allows you to search for specific philosophical concepts and provides relevant case studies and scholarly articles.
- PhilPapers also categorizes its resources based on subfields of philosophy, making it easier to find case studies related to your specific topic of interest.

Remember to verify the credibility and academic rigor of the sources you find. It's essential to use reputable and peer-reviewed materials to support your understanding of philosophical concepts in Paper I.