PACKAGING CORPORATION OF AMERICA (PKG $67.77 rated Neutral with $81 up from $64 price target) LOWER OPERATING COST ESTIMATES BASED ON SYNERGIES AND THE START UP OF THE DERIDDER MILL IN Q4 2014; HIGHER PACKAGING SEGMENT REALIZATION ESTIMATES BASED ON Q2 2014 RESULTS AND ASSUMED FLAT PACKAGING PRICING THROUGH 2017. 7/25/2014