I think I am missing something. From what you said, it sounds like my preferences ought to cause SpamSieve to filter messages that are in the Junk mailbox and put them in trash.
It does not. I still get hundreds of emails in the Junk folder every day. I still have the script we figured out to manually filter the Junk mailbox, and it still works, but if there is a way to filter messages that are in the Junk folder without running a script, I’d much rather do that.