Tainted Peanut Butter!!

There's tainted peanut butter in my cupboard! Or was, rather... my youngest daughter looked at the code on the lid, and sure enough, it's one of the recall jars. It was almost gone, but none of us got sick. I told her to throw it away, but I wonder if that was silly. If we already ate almost the whole jar, and didn't get sick, it must be ok, right?