Here are the instructions for printing a report for all closed orders that include unit information:

Go to Open Orders
Select F7 Print
Select Option I for Workorder History
Search for the customer you want to generate a report for
Remove the unit info to report all OR select a unit that you want to report for
Enter the date range to report for
Leave the Exclude Estimates checked
Click OK.
If you want to view this in Summary, click the Summary button on the report preview bar at the top of the screen.