You are correct: "[The] Vatican may not be the most impartial of analytical bodies". In fact, it is the most critical and skeptical. Any kind of pedestrian and commonplace explanation for seemingly miraculous phenomena is given the "benefit of the doubt" in the beginning until it can be dismissed. This is because the Vatican requires the highest standard of evidence for those occurrences that are pronounced miraculous in the end.
No, I'm not going to spend an afternoon and wade through volumes of Italian to satisfy your request. But rest assured many of us have seen references to these investigations.