Then there's "Metamerism" whereby 2 colours appear to match perfectly under one set of lighting conditions (say daylight Fluoro) at your workbench, yet look like 2 different colours under the incandescent lighting in your living room (normal light bulb). Never trust published photos for definitive colour reference, they can only be used as a general guide. There are too many variables in the repro chain. The digital camera or scanner interprets the original scene in it's own way, your computer monitor then interprets those colours in it's own way (thats why the same colour can look very different on different monitors), then of course the printing press will reproduce those same colours according to how the printer adjusts and maintains it during the print run. Oh, and if he has worked a 12 hour shift and his eyes are tired, what he finishes the run with, may have drifted away from what he started with 12 hours ago. Trust me ...............I'm a printer! Interesting topic Salty, but don't sweat over the colours on the box top too much mate, they may be wrong.
Cheers...Snowy