I'm surprised none of the Rogers guys here have shared their wisdom. Maybe it's no big deal.
JR!
I really don't think that it's a lack of our Rogers guys sharing their wisdom, which I count myself as one of them, but rather that this green label thing is just an anomaly. I think that Glenn hit the nail on the head that this was simply a printing issue. I was in the graphics/newspaper industry many years ago, servicing laser imagesetters. I had many opportunities to be in the actual printing and proofing areas of so many businesses and you'd be surprised at how many times mistakes are made before the final product is approved.
Like Glenn mentioned, this was probably just an issue with certain colors not mixing properly, or even being out of some inks. They probably just chose to send a small batch of these green ink labels and Rogers accepted them. That's my educated guess. We may never know that real reason, but these kind of things are always going to be with us!
-Mark