Packaging Corporation of America announced the completion of its acquisition of Boise Inc. After the previously announced completion of the tender offer for all of the outstanding shares of Boise, PCA completed the second step merger under Delaware law, making Boise a wholly-owned subsidiary of PCA. The combined company, headquartered in Lake Forest, IL, is the fourth largest producer of containerboard and corrugated packaging products in the U.S. PCA will now operate eight mills and 97 corruga...