[ubuntu] Logs Erased or Purged Server 12.04

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http://ubuntuforums.org – I went to check my server logs today and it looks I only have stuff beginning January 6th. When I use the 'last' command I only see logins from today and when I check auth.log I only see entries from January 6th and in syslog only from today.. Did something happen after the 1st? Anyone have this happen to them before? Also my server hasn't rebooted in 19 days.. (Hardware)