Packaging Corporation of America reported first quarter 2019 net income of $187 million, or $1.97 per share and $1.98 per share excluding special items. First quarter net sales were $1.73 billion in 2019 and $1.69 billion in 2018.   In the Packaging segment, total corrugated products shipments and shipments per day were up 0.7% over last year’s first quarter. Containerboard production was 1,037,000 tons, and containerboard inventory was up 9,000 tons from the fourth quarter of 2018 and up 42,000...