Put it just before the reveal, after a shot of the sealed box or closed door, then follow the moment someone opens it anyway with an evil laugh, or cut to a mysterious button if the contents stay hidden for another scene.
关于此声音
This is a 7.5-second Turkish voice clip built around the repeated warning 'sakın ama sakın açma', meaning don't ever, ever open it. It creates tense, playful suspense, the feeling of being dared to peek while knowing you probably shouldn't, and works best when the listener is already reaching for the lid, door or file.