Great Value Jumbo Pitted Black Olives, 5.75 oz

I normally buy great value olives and have always like them however, the last time I purchased them, I opened the can and after draining them, toss them into my salad. It was the Christmas Eve and my guest had arrived early, and I never bothered to check before I dumped them into the salad. When I sat down and had some salad, I realized there was no olives in the salad, but they were black grapes. Yes I said black grapes. I was amazed that none of my guest commented about the olives. I know this couldn't have happened at the store so it must've happened when they were packed. I didn't realize it until the next day because I didn't eat any salad on Christmas Eve but had it as a snack while I was preparing Christmas dinner we had. I had a good laugh about it when I called Walmart they also found it unbelievable, but refunded my money for the olives. I only called them because I was concerned that food was being tampered with at the packing plant. I'm normally very satisfied with them. They are firm and not soggy and taste delicious.