According to a source, MeatBall Kitchen at the Natick Mall in Natick is apparently no longer in operation, with a check on its website seeming to confirm this, as the site shows only the Wilbraham location now. A few posters on Yelp mention that the Natick eatery is shuttered as well, though no specific information on why it closed has been given.
MeatBall Kitchen first opened its Natick location last August, featuring a variety of meatballs along with soups, salads, and appetizers.
The website for the original shop in Wilbraham can be found at http://meatballkitchens.com/
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[A related post from our sister site (Boston's Hidden Restaurants): List of Restaurant Closings and Openings in the Boston Area]