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Bill, I think it looks like just plain oxidation. It almost appears, in what I can see of the pic, that it's initially be somewhat random but looking closer, that maybe the meat was overlapping and the dark hues may not have been covered by another piece of meat, allowing the exposed pieces at oxidize a bit. Furthermore, if the apple juice had a higher acidic base it could have possible promoted a bit of cooking via chemical reaction (I huge possibility if tin/aluminum foil was used)That looks like luminescence - never seen it that prevalent before. What was in the rub that you used? If the meat smells okay then go ahead and cook it. Bill
Return it back to Costco. They have a liberal return policy and will refund or replace the item.
I had the same green issue, only the package was still sealed and 3 days away from expiration. The spot that turned green was really tight against the plastic wrap. It smelled bad through the wrapping. Costco and "Good nature" brand did not respond to my inquiry.