Gmail: Find archive-only messages

i.e., archived messages/conversations with no any other label assigned.

Terra Nomad: Gmail tip for finding archived items with no label

To find them, search this: "-label:inbox -label:blog -label:comp ..."
You have to add a -label:tag for each tag, so it can take a while to write. But bookmark it and you never have to write it again!

To update here when more is found...