I bought a container of these yesterday. The Castelvetranos I've had in the past were from olive bars or the Mezzatta brand. They've always been very mild flavored. The Verdis have quite a bit more bite. I wouldn't think they could go bad, at least not in the time they've been in the Costco case, but I could be wrong. Is this typical of this brand, or did I maybe get a bad tub? There's no expiration date on them.