/usr/share/aide/config/aide/aide.conf.d/31_aide_squid is in aide-common 0.16~a2.git20130520-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | !/var/spool/squid/[0-9A-F]{2}/[0-9A-F]{2}/[0-9A-F]{8}
/var/spool/squid/(netdb_state|swap.state(.last-clean)?) VarFile
/var/spool/squid/[0-9A-F]{2}(/[0-9A-F]{2})?$ VarDir
/var/log/squid/(access|store)\.log$ Log
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