Shipments are modestly up and the company's full-year profits are on track to meet expectations.Shares of packaging company Crown Holdings (CCK 1.91%) jumped on Tuesday after the company reported financial results for the first quarter of 2024. As of 11:15 a.m. ET, Crown Holdings stock was up about 3% but had been up by nearly 6% earlier in the day.Lower sales but higher shipmentsIn Q1, net sales for Crown Holdings were down 6% year over year to about $2.8 billion. That would be discouraging without context ...