You can find existing cases in SAP Service Cloud Version 2 in two ways:
In the My Cases Summary card available in the home page. This card shows you the number of cases assigned to you, grouped by priority and status. You can click on any of the numbers to open a list of the corresponding cases. You can also click on the View All button to see all your cases in a table view.
In the case worklist by choosing the Case app from the menu. This app allows you to view, filter, sort, and search for cases based on various criteria. You can also create new cases, edit existing cases, and perform actions on cases from this app. References = Solution Guide for SAP Service Cloud Version 2, section Cases.