When you find that there is detailed personal information on the outer packaging of the neighbor's express delivery, it is possible to use this information to contact them to solve the problem of taking the express delivery by mistake, but you need to pay attention to the following points:： 1. **Respect for privacy**: Although you want to solve the problem out of good faith, your personal information is sensitive and you should try your best to avoid unnecessary use or dissemination of this information. Use this information only if it is really needed. 2. **Direct communication**: If you live in the same building or nearby, it is best to knock on the door directly or contact your neighbors through property, community and other channels, rather than using their personal information by phone or other means. This can avoid making the other party feel uncomfortable or worried about privacy leakage. 3. **Short description**: When contacting neighbors, explain the situation succinctly, for example: “Hello, I found that a courier may have been delivered to your house by mistake. I want to confirm whether there is a situation of taking it by mistake. ”This is both direct and polite. 4. **Avoid misuse of information**: Do not use your personal information for other purposes or disclose it to third parties. This kind of behavior is not only unethical, but may also violate the law. 5. **Legal awareness**: In many countries and regions, unauthorized use of other people's personal information may involve privacy infringement. Therefore, it is important to deal with it carefully to ensure that your behavior is legal and in compliance. In short, if you do need to contact your neighbors to solve the courier problem, it is best to do so in a direct and friendly way, while respecting their privacy. This can not only effectively solve the problem, but also maintain good neighborhood relations.