I don’t think (real) bacon bits come in boxes because they’re too greasy. But since K is merely a letter of the alphabet, anyone can use it. In practice, it usually means that someone claims it’s kosher, whether a rabbi, a pseudo-rabbi, or the manufacturer. It’s unlikely anyone would claim that bacon is kosher.
Remember a few years ago when labels on treif meat in some random supermarket in a non-Jewish neighborhood had some Hebrew or Yiddish words on them? Apparently the store had purchased some used labeling equipment.