China Post Express sends SMS number.

False, the post office is the supervision unit of the postal industry, and China Post is a group company with independent legal personality. People inside the post office will know this, and the post office is not responsible for specific business. The person who asked you to pick up the mail should be from China Post, and the person who sent the text message claimed to be from our bureau. The person who sent the text message doesn't even know this, so he is definitely not an insider. From this alone, you can judge that he is a liar.