May contain traces of peanuts
As you do when you have a lot of work to do, you take a sudden interest in all sorts of things. I looked at the label on a packet of mixed nuts I bought and it had the following warning in bold: "May contain traces of peanuts". Ok, that appears in just about all food, but looking at the ingredients, it has peanuts (33%).
The bag of beers nuts I bought had the same warning. Maybe they were talking about the label.