If you find that your neighbor's package has detailed personal information on the outer packaging, and you have taken the package by mistake, the best way is to solve the problem through the following steps: 1. **Direct return:** Deliver the package directly to your neighbor's house and leave it in front of their door with a short note stating that you took their package by mistake and apologize to them. 2. **Management office or front desk:** If you live in a place with property management, you can hand the package to the property management office and ask them to notify the neighbor to pick it up. 3. **Official contact:** If you cannot return the package directly or contact the property, you can try to resolve it through the courier company. Most courier companies have a customer service hotline that can assist you in contacting the recipient. 4. **Avoid using personal information to contact directly:** Try to avoid using the personal information listed on the package to contact the recipient directly, such as calling or texting, as this may violate the privacy policy and may even be regarded as improper use of personal information. Always respecting the privacy of others is the best way to deal with this situation. If you cannot return the package directly or contact your neighbor through official channels, the above methods should be given priority.