Email from logcheck(1) contains:
    E: File could not be read: /var/log/syslog
    E: File could not be read: /var/log/auth.log
which do not exist in bookworm 12.5.
The offending file:
    /etc/logcheck/logcheck.logfiles.d/syslog.logfiles
contains both filenames.
    Thanks,
    John
-- 
John Conover, conover@panix.com, http://www.johncon.com/