Archiving should, at this moment, only be used with droplets.
The idea was:
filter all contentitems where published dates are done and archive is set
or show all items where archive is set and publishdates are greater then 60 days
or ...
There is no current use for them in the module
One of my original ideas was to auto-delete not archive items after publishdates are over, but didn't implement that yet.
The contents module still is in development

John