An Unexpected Tag

Among the birthday gifts showered on me by a grateful nation last week was a bottle of champagne, to which was attached a small laminated plastic tag with the legend 'Remove before microwaving'. These mysterious tags turn up, it seems, on all manner of unlikely items - DVDs for one. I wonder if they are there for any other purpose than to be removed before you carelessly toss your bottle of champagne or DVD into the microwave. Once they are removed, is their work here done? Are they perhaps like the famous notice that says only 'Do not throw stones at this notice'?