LW should not have overwritten them. (1) check the above link in Birdy's post. (2) Check both your Saved Files & Shared folder in your Library window. Files will not show in Shared unless they are shared files. If you find them in Saved files folder, right-click each of the files & choose share to have them show in Shared folder.

A simple search using your computer search function should find their exact location. Search .mp3 for example.