In order to see the items that are placed on reserve for a course, you would need to go to catalog.case.edu and choose "Course Reserves" from the right-hand side of the page. This will take you to a page that will allow you to enter either the class name/number or the instructor's name (on a separate tab). If there are items placed on reserve, they will show up on this next page.
Also, if you do a search for a specific item in the catalog and it shows a course name for the call number, that item is on reserve for that class.
You can also always ask a staff person at the main Service Center desk what items are on reserve for your class when in the library.