Currently the trash is set up as one big folder with everything trashed, which is hard to use. Improvements that better coordinate with file location would be helpful. Here are a few ideas from the web UI side:
Autopopulate or provide a location drop down for the Original Location field in the search dialog.
Provide a trash link in each folder or when a folder is selected provide a "View Deleted Items" link in the sidebar that will provide a view of only the items that were deleted within that folder.
Provide better sorting of the trash by original location. This could be by allowing folders to be selected for view, a tree view, or some other means of organizing deleted files by location.