I am using Moodle 2.4
As an Administrator, you should be able to directly access the database, using PHPMyAdmin. You can use the SQL search tools to create a report that provides you with the information you require. If you cannot access PHPMyAdmin, it is downloadable as a plugin I understand, or you can approach your system admin or manager to provide you with what you need. They may be able to provide you with a new report function if you will need it again.