You are conflating Best Buy's obligations with respect to the box itself and their obligations with respect to the material contained in the box. Your logic would seem to imply that an offended reader could sue Best Buy for libel or plagiarism on the basis of a sentence in a book purchased from Best Buy's meager rack of paperbacks. The responsibility for the truth or copyright of the book contents rests with the author and publisher. Responsibility for license compliance of the software contained in the box likewise falls upon the packager/publisher.
I don't see that purchase of a washing machine provides an obvious parallel case, except perhaps if there is a question of patent violation. But there again violation would be attributed to the manufacturer, not to the retail outlet.
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