Hi Brant,
What do you mean by "user stories which are done"? Do you mean "accepted"?
The user story's state is stored in the ScheduleState field.
You can use either the Plan -> User Stories to filter by the ScheduleState (and choose 'Accepted') or you can also choose the Plan -> Work Views page where you can choose the project/s then choose to display user stories and then include a similar filter on ScheduleState.
Please let us know if that helped.
Sagi