Expired Box Tops?

I've been trying to make up a small index card size note to tuck into the Summer Box Top bag (Post and photo coming soon) that would show the official box top label and also assist parents in differentiating the campbells soup label from the Box Top. I wanted to be sure they checked the expiration date (we have A LOT expiring June 1st) too! Hope this works! I plan on putting a Box Top magnet on the other side of the index card as well!