You are looking for a little magnetic cap-box. BYOP.
你需要寻找一个带磁铁的瓶盖容器。
This cache is easy to search but you have to mind the customer and the muggles. People would be less if during work time.
这宝藏很容易，却需要避开顾客和麻瓜。如果你在工作时间来这里，你会发现周围人很少。
Please return the container back to the exact place.
请将容器放回原来位置。