When making the i Tunes consolidate files, i Tunes will make copies of any i Tunes Library files that weren't already in the consolidated folder. About the i Tunes consolidate files duplicates, it is beneficial because you can still access your music through its old location, but if you have limited space available on your hard drive you may wish to delete the duplicates or make i Tunes merge tracks of files.
Thankfully, in i Tunes, there is a simple way that can help you easily delete duplicates. You can click the dropdown box in the upper-left corner and go to "View" and find "Show Duplicate Items".
Now, the list will show you the duplicates that are only in the same album.
Maybe you will find i Tunes consolidate files not working.
i Tunes can even consolidate all of these files into one folder quickly and completely, making them easy to be found and to be transferred between machines and devices.