Packaging Corporation of America reported first quarter 2017 net income of $117 million, or $1.24 per share and $1.27 per share excluding special items. First quarter net sales were $1.5 billion in 2017 and $1.4 billion in 2016.   In the Packaging segment, total corrugated products shipments with one additional workday were up 10.7% and shipments per day were up 8.9% over last year’s first quarter. Containerboard production was 932,000 tons, and containerboard inventory was down 16,000 tons co...