Canary In The Box Plants: Packaging Investors Just Saw $3 Billion Wiped Out in One Hour

But the shoe dropped Tuesday, when box shipment data were released for March, coming in much weaker than investors expected. A decline in box shipments is the main takeaway from the March box data and “it’s hard to spin that number as anything other than disappointing,” according to Seaport Global analyst Mark Weintraub.