The wallet is an item found in Freddi Fish 3: The Case of the Stolen Conch Shell.
Freddi Fish 3: The Case of the Stolen Conch ShellEdit
Freddi Fish and Luther finds the wallet near the sunken airplane inside the underwater volcano. It is loaded with orange sea urchins and holds the identification card of whoever it belongs to. Once the wallet is returned, the owner gives Freddi and Luther an orange sea urchin in return for finding it.