Corrosion on steel head shells is a known storage issue.
They certainly were not shipped from Italy that way.
I've been sold corroded Winchester shells from Bass Pro, and corroded Fiocchi shells from Guns Galore.
Brass head shells are not immune from storage related deterioration either.
The steel head shells do not age well in paper boxes in any environment above 50% or so humidity.
Considering the stuff likely gets here in a shipping container on a boat it's amazing the condition on delivery is as good as it usually is.
