Deleting the original files iTunes
iTunes does not keep track of where imported files were originally found. In other words, it knows where the copied files are (within the iTunes folders) but it has no record of where the original files are scattered around your hard drive.

That said, you could use Spotlight to find the files. Note that for this method you will need to know where your iTunes folder is. (Unless you have moved it, it is located at /Users/your-username/Music/iTunes.)


Open Finder.
Click on your computer's name in the sidebar under Devices.
In the search box at the upper-left, type kind:music. (A drop-down menu will appear asking if you meant "name: music". Click outside of the menu to make it disappear.)
To the far left, right under the search box, you will see two buttons, "Save" and a plus sign. Click the plus sign.
On the new row that appears, it should say "Kind is Any". Across from this there is a minus button and a plus button. Press and hold Option and click the "..." button (which replaced the plus sign button because you are pressing Option).
Now click the minus button on the "Kind is Any" row.
You should now see a row that says "Any of the following are true". Change "Any" to "None".
On the line below that, click the first drop-down menu and choose "Other..." at the bottom.
In the window that pops up, type "folder". You should see two results, one of which is "Document Container". Click on that line and click OK.
Next to where it now says Document Container, change "matches" to "contains".
In the box, type iTunes.


This will search for all files on your machine that are music, and that do not live in the iTunes folder. All of the resulting files should safely be able to be removed.