[xubuntu] How do I restore the default icons for the default folders?

I'm on a new installation of Xubuntu 16.04. This happened after Thunar crashed. I wanted to replace the Documents, Downloads, Music, and Pictures folder with shortcuts to similar folders to a different partition. Thunar crashed when I did a cut-and-paste on some of the files I needed to move. When I restored (from trash) the original folders because I decided I wanted to keep them, their icons reverted to generic folder icons. I tried deleting some of the rest of the default folders (Public, Templates, Videos) but, as you can see, they restored properly. How do I get the original specialized icons for the default folders?