Bought some dried blueberries from Costco Canada yesterday to make port. It says on the package contains blueberries, sugar and sunflower oil. MAY contain peanuts, tree nuts, wheat, soy, milk and eggs. Is the "MAY" because it comes from a plant that processes these things or it probably does contain some of them? Red flags went up and I haven't opened them yet. Any input on this?' Has anyone used something like this before?