In Cflow, every request in a workflow has a default auto-increment ID for identification purpose. You can search the request in Stage Inbox/with the ID.
1) Go to Workflow Setup -> Workflows.
2) Select a Workflow -> Click Form Creation.
3) Click on the Request ID field.
4) You can select the option Yes if you want the ID to be displayed in the Stage Inbox.
The following screenshot illustrates the ID in Stage Inbox.
