The instance ID or number would need to have been set within a field in the form for you to view it. This would at least allow that number to display in the Data History of the instance.
For easy reference within the instance list, use your instance ID or number in a formula applied to your instance name. This is modified in the Form properties. I recommend setting the instance name to the name or direct reference of the submitter/subject + Instance Number. This should help in identifying those instances.
For more information, refer to the following: