Copying the company's postal sorter training materials before leaving the company but not making them public?

Crime of unifying data. Specifically, whether this situation constitutes a crime needs to consider the following points:

Illegal acquisition: you copied the company's training materials with your personal USB flash drive without permission, which may be regarded as illegal acquisition of computer information system data.

Never leaked: although you said that the information was not leaked, it does not affect the judgment of whether it constitutes illegal acquisition. The key is whether you copied the company's information without authorization.

Legal Consequence: If it is found to constitute the crime of illegally obtaining computer information system data, it may face penalties, such as criminal detention, public surveillance or fines.