@Ponderable OK, thanks @Ponderable. That does make it a bit easier , and if you have whole pages of games to archive, you can click "select all", then "move".
Depending how much work it is for @Russ, an option to archive all completed games would still be welcomed.
OK, next idea...
A button that moves all completed games from the In-Box to the Archive folder.
Every few weeks I move them one my one so they don't clutter up the in box. I'm thinking that there should be a quicker way.