An admin can restore courses that have been reset or deleted. You must know the Course ID number to restore the course. If your instructor cannot locate the Course ID number, you can access the instructor’s user details and look for the Course ID under Page Views. The Course ID can be found by viewing the number at the end of the browser URL of a page view in the deleted course (e.g. account.instructure.com/courses/XXXXXX).  

Restoring a course restores the previous course URL and all content. However, enrollments cannot be restored.

Note: Using an SIS ID will not restore a course unless the course was deleted via SIS.