Office Depot says it will close 400 locations over the next 24 months — part of the fallout from last year’s acquisition of OfficeMax — but we’re told the Shady Grove Road store will not be on the chopping block. Sales at that location have been consistently strong, a manager said — strong enough, in fact, that the company would like to open another store in Rockville. There used to be an Office Depot at the intersection of Rockville Pike and Twinbrook Parkway, but it closed not long ago to make way for a Walmart that never happened.