My MIL gave me a gift card to ON for Mother's Day which was really unexpected and very sweet. I finally went today, shopped around, and went to pay using the gift card. The cashier informed me that there was 0 balance and that I should call their 1-800 number. Turns out money was never put on it to begin with. I'm sure it was a mistake of some sort as she has given these to me before with no issue. Would you politely inform your MIL or just let it be?