"It's more likely," Regulus spoke up, "that he wants to figure out how she took it. No one's ever stolen from Gringott's before, maybe he thinks she knows something new." It was just a Cup. If it were so important to him, why would he give it to Regulus's cousin? Everyone knew she was as unhinged as she was devoted, and her husband wasn't much better. Regulus wouldn't trust either one with so much as a self-watering potted plant.