[CALUG] Strange log file permissions

[Steve Gregory]

One of my clients has a server with some very strange permissions. 
/var/log/cups/access_log does not have any root permissions and has a 
long number as its user and group. I am not able to change the 
permissions as root, nor will a weekly rotate work. I have suggested to 
the client that the server needs to be rebuilt, since there might be the 
possibility that the machine was rooted. He would like a second opinion. 
Any thoughts?

Steve