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Ah, yes, the product will need reviews before it shows up. In my experience, specifically with rich snippet ratings, they don't usually show up immediately. A couple things can help to get them to appear quicker. Sometimes it seemed that products that had more reviews appeared first. Also, once your markup is correct you can go into Google WMT and resubmit the pages to the index using the 'Fetch As Google' tool. You can also check to see what pages the structured data markup is being found on with the 'Search Appearance > Structured Data' section in Google WMT.