Trashed files are stored in the FreeDesktop standard location: ~/.local/share/Trash/files. How do I restore or permanently delete files in that folder using dired?
You can use Trashed in MELPA. This package provides you a simple but convenient user interface to manage trashed files. It supports both MS Windows Recycle Bin and freedesktop.org Trash Can. See https://github.com/shingo256/trashed