In order to avoid disputes, all employees should be retained while alive. Even if he leaves his unit, he may get it back at any time. At this time, occupational health records are evidence.
Legal basis: Article 18 of the Administrative Measures for Occupational Health Examination in People's Republic of China (PRC) shall establish occupational health examination files. The archive of occupational health examination shall be kept for no less than 15 years from the date of the last occupational health examination of workers.