Puzzle or Mystery?

It can't be both, at least according to Malcom Gladwell's definition.

Puzzle: Pivots around lack of information e.g. Watergate scandal, Osama bin Laden’s whereabouts. Can be solved with more information.

Mystery: All the information is available to everyone but the mystery can be resolved only when someone has the time, expertise and tools to analyze the information and spot the hidden red flags. e.g. Enron and Satyam failures, Great Financial Crisis of 2008.