help!

So my daughter and I were playing outside while her brother was taking a nap. Well I saw her going after something shiny on the ground I thought it was glass so I ran over there. Well on the ground was a cd that said love Tasha to sexy Evan which is my husbands name. I asked my husband about it and he said he doesn't know where it came from. What should I do? Should I just drop it? Or should I stay mad.. I'm already suffering from post partum and I'm just not sure how to feel