The Jumbalees in Hidden Treasure A Hidden Treasure Hunt story for Kids ages 4 - 8 illustrated with cartoons

In this story the Jumbalees go on a hidden treasure hunt. They split up into two groups, three of them search the beach and the other four look in the jungle. Several interesting items are found but a golden coloured object buried in the sand at the beach causes the most excitement. Is it valuable treasure, how did it get there and who does it belong to?