Is there a way to tell if a folder/file has been deleted from the /files/{file_id} endpoint? Should I be including a specific field in the fields query param to get this data? 

Was looking at the example API response and it looks like there’s a field called "trashed_at" that indicated when a folder was deleted but if it hasn’t been deleted will that field be null or not even be returned? 

Same for Groups/Users?