Returns True if no changes have been made to a publication since it was last saved. Read-only Boolean.
expression.Saved
expression Required. An expression that returns one of the objects in the Applies To list.
If the Saved property of a modified publication returns True, the user won't be prompted to save changes when closing the publication, and all changes made to it since it was last saved will be lost.
This example saves the active publication if it's been changed since the last time it was saved.
Sub Saver()
With Application.ActiveDocument
If Not .Saved And .Path <> "" Then .Save
End With
End Sub