View Trash files on External Hard Drive

I don’t often empty out my trash for fear of losing a file, even though I have backups. Is there a way to view only the trashed files that are on an external drive?

Looks like there was an app called curb that is no longer available. When I try to open the .trashes folder on the external, I get an error "can’t be opened because you don’t have permission to see its contents.