It seems to vary, depending on how the original file was constructed, as to whether the creation date is retained across "importing" the document from an email attachment.
If you open the attachment from within the email, you should be able to see the original statistics, as you haven't saved the file - at least this is true for OE.
Even if the creation date is the date you saved the file, you should still see the Last Printed time.
Bear in mind that the information can be highly misleading - if someone takes an existing document, Saves As and effectively creates a new document from that rather than using a template to create a new doc, the stats can be months or years out!
SD