Trash Sound Effects Disappeared

I don't know how this happened, but my Trash sound effects disappeared. All of my audio settings are turned on and other sound effects in the computer are working. I even tested the Dock by placing a blank folder into it and removing to hear the "poof" sound with the white cloud that appears. I cleared the PRAM and ran Disk Warrior. The problem remains.

For example, when dropping a file into the trash, there used to be a little sound. and then when emptying the trash, I would hear the crumpled paper sound. But both sounds are gone.

Does anyone have a solution?