Is the China Post Confidential Bureau a confidential unit?

It is a confidential unit.

The China Post Confidential Bureau is an agency affiliated with China Post Group Corporation. It is responsible for processing and protecting the security of important national documents and communications. The China Post Confidential Bureau is a confidential unit.

China Post Group Corporation is a large-scale state-owned enterprise established on the basis of the operating assets of the former State Post Bureau and some enterprises and institutions.