Deleting Songs

Hi,

I wanted to delete some songs from my computer in the iTunes library.
I have, however accidentally clicked "Keep Files" when I meant to click "Move to Trash"



Now, the files are not in my library but still in different folders and subfolders in Finder, and it would be tedious to manually locate them to drag them to trash.
Any idea how I can move all these files to Trash without manually searching?
I don't suppose I can "undo" delete in iTunes.

Thanks!