Find The Confidential Document

Dream up a situation that you are a sincere cop. You have caught a document, which is the proof of all the undergoing smuggling activities in the City. It is kept in the police station. Meanwhile, you got an information from the informer thet some bad cops going to steal the document and planned to destroy it. Before they get the document, you need to get back it as soon as possible. As you are a sincere cop, you have the courage to do it. Surely you will succeed by finding the necessary objects and solving the puzzles.