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Under Missouri Law, the trunk was still yours. Your sister agreed to store it for you, and under the law, she would not get any proprietary interest in it. If your sister could no longer store your trunk, she would have a legal obligation to inform you in writing that she would no longer store your trunk and give you thirty days to go and retrieve the trunk.
What you have here under the law is a "Bailment" where an individual holds the property of another. When you go to a restaurant and leave your coat with an employee who gives you a "claim check", but because you pay to check your coat, it is a "Bailment for Hire" which means that they must exercise a reasonable amount of care in protecting your coat. In a Bailment where the owner does not pay the individual anything for storing their property, they only have to exercise "slight" care in protecting the property. Therefore, you probably could not collect the value of the book from your sister, but since you know that her son took it, you can sue him for the value of the book. Kindly rate my service to you so that I can receive credit for researching your question and furnishing you with an Answer and what recourse you have. It will not cost you anything additional, but, without a rating, I will not receive any credit for assisting you. Thank you for understanding,
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