BLUE BOX BINGE: The Middle Eastern nation of Qatar continues to stock up on Tiffany & Co. As of Monday, the country’s sovereign wealth fund had acquired an additional 3.2 million shares of the luxe retailer, giving it a total of 14.3 million shares, according to a regulatory filing. That boosts the country’s stake in Tiffany to 11.3 percent from 8.7 percent as of Dec. 31. So far this year, Tiffany’s stock has gained 22.2 percent to $70.06.