The issue is in SBG ‘Message Audit Logs’, whenever we try to collect logs for a single date or past week, the total mails logs is not showing.i.e.: if we select date of a day or select past week, it do not shows entire day. The total logs is only shown for few hours, this is increasing the time limit to check any logs and manual task. Also i have gone through below link in which it written the maximum number of messages that the message can return for a query is about 1,000.

About message audit logging

http://wwww.symantec.com/docs/HOWTO53379