How to acknowledge an empty card

Dear Annie: My daughter graduated from high school a few weeks ago and had sent out announcements to family and friends. She has been receiving congratulations cards and notes in the mail, and some have included monetary gifts to acknowledge her going to college in the fall or just in celebration of her big life event. Monetary gifts are definitely not expected, but I’m concerned about how to address a card that arrived from family friends who have been in our lives since my daughter’s birth; they are the in-laws of one of my siblings. The card arrived with nothing enclosed, and though that is not unusual, the envelope was open/unsealed (looked as though it was never sealed), and the card was inserted with the open portion facing up. I’m thinking one of two things happened. Either a check or cash was included and fell out or was taken out or nothing was enclosed and the envelope was mailed without being sealed well.

My quandary is whether I should mention something to the senders. If they did enclose something, they would want to know that it was missing when it arrived, but if they didn’t, I don’t want to make them feel uncomfortable by mentioning it. What is the best way to handle this type of situation? — Grateful for Love From Family and Friends

Dear Grateful: Before I answer your question, I want to tell you how much I love your signature. Gratitude is one of the best life skills anyone can cultivate, and the fact you are feeling gratitude for two of the most important things in the world — your family and your friends — is excellent. As for the card in question, your thoughts make perfect sense. If my check were taken or I didn’t seal my envelope, I would want my friend to tell me. Thank your longtime friends for the card, and explain to them the way the envelope arrived — that it looked as if someone tampered with it.