If it were shipped in the US, an MSDS or other statement as to chemical contents would need to be attached to the package, or easily accessible by emergency responders (at least, that's the DOT's requirements...)
Of course, being somewhat familiar with MSDS's, most are written so as to describe how to respond when 55 gallons are spilled, or a person is sheep-dipped in the stuff, not merely how to respond for small spills, so the respond is likely to be over-kill, until they know what they're dealing with.
As for the comments regarding the 'heightened security environment', I understand that Cuban cigars are great, but hard to stay lit while being water-boarded.