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Why Mystery Boxes Are a Great Way to Build Brand Loyalty A mystery box is an effective method of engaging the audience in a story which will take time to end. JJ Abrams uses this technique often in his films. His film Lost was a great example of this. He asked the audience questions that were not answered and then clung to their interest for a long time. They provide a carefully selected selection. Mystery boxes are a growing trend in the world of e-commerce.