I am sure you are aware already but in case you aren't, definitely bring them back to Costco for a full refund, even if opened.
I bought some gluten free cookies that were the nastiest thing I ever tasted. (had nothing to do with the gluten free aspect, they were just really bad). They gladly took them back and the guy said they had been getting a lot of returns on them. I guess maybe some of the buyers have "off" taste...
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