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I have purchased from the boutique in LV also and a couple purchases online. Did you clarify with anyone from Cartier that you would still be eligible for no tax if you purchased from the website. I would think since Cartier is available to you in your home state you would still be responsible for the taxes.
I bought my items in Cartier boutique, there is a gorgeous one where I live, Europe, and it is a whole experience, I feel buying online takes away part of the "Cartier adventure"