Thanks Keith, It helps and understand the behaviour. So, if we want to get the "potential space saving" as part of this disposal, we have to run the Statistics report or SQL Query to calculate the space before delete via policy?
The reason because, [AuditDocumentEventArchive] & [AuditDocumentEvent] maintains the records deleted , but it does not tell the Size or file extension like "MetaData" table. Even, all the Audit reports telling the file names, reference, policy and category, but not th size and space saved once repository status changed "Managed" and all the documents deleted.
It is also expected behaviour or any place we can check the potential space saving after dispose all the documents ?