Seriously? Do you even understand the idea of being skeptical?
Consider the following....
* The FBI had to get a search warrant to read these emails, how would the NYPD know what was in them without a Search Warrant?
* If the Detectives looking into it illegally opened and read the emails, why would they tell their superiors that they had broken the law and potentially destroyed any case they could get from them?
* Speaking to the media is already a potential breach of the law, as we have seen with Comey, holding a news conference is doubly so.
* Finally, the Article claims that "Chief" is second only to the Commissioner. Not true. The Chief of Staff is, but this Article refers to "a NYPD Chief" which is not the same thing. After the Chief of Staff is the First Deputy Commissioner, and then come a number of Deputy Commissioners, eighteen in total.Then we have the Chief of Department, again a singular role that would not be referred to as "a NYPD Chief", and under him 11 other Chiefs, each with a specific Job Title.
This is the level where we're likely find this "Chief," but since each is only responsible for their own Bureau, and since this would have to come under The Detective Bureau, there is only one Chief it could be, Chief of Detectives, Robert K. Boyce. Now since it wouldn't be possible to remain anonymous, and he's know that, what would be the point. As such I'm pretty sure that the "a NYPD Chief" is not Chief Robert K. Boyce, but rather a figment of the writer's imagination, along with the rest of the story.
Now there are a few more Cheifs lower, namely the Chief of Detectives for Manhattan, the Bronx, and Brooklyn, plus a number of Assistant and Deputy Chiefs, but since the article stated "a NYPD Chief, the department’s highest rank under Commissioner" it certainly isn't this far down the tree, and is most likely the result of the writer getting their knowledge of the NYPD from a TV show.
For the above reasons, and the fact it reads like a HDS checklist, the fact you even posted it makes pretty much anything you post on the subject pretty much as worthless as another poster who keeps using the likes of the NY Post and WND as his sources.