How did the boy loose the bell in the polar express?

In "The Polar Express," the boy loses the bell when he reaches into his pocket to show it to his friends after the magical train journey. However, he discovers that the bell has fallen out and is lost in the snow. This symbolizes the loss of childhood belief in magic and the transition into adulthood, as only those who truly believe can hear the bell ring. Ultimately, the bell serves as a reminder of the importance of faith and wonder.