Historical server_log data

I have a client that is asking if there were any "nas" related issues on a certain date.  Porblem is when I run server_log server_2 it only gives me so many days.

Is there any other logs that would give me older info?

EX:

[nasadmin@cel5593cs01 nas]$ server_log server_2 -a -s | more

NAS LOG for slot 2:

--------------------

2012-08-02 19:53:10: ADMIN: 6: Command succeeded:  volume hyper 4895 1 4894

2012-08-02 19:53:10: ADMIN: 6: Command succeeded:  volume slice 4896 43810816 40960000 4007

They want data from 2012-07-25

Thanks!