/usr/share/aide/config/aide/aide.conf.d/31_aide_spamassassin 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 5 6 | /var/spool/spamassassin/bayes/(bayes_(journal|toks|seen)|auto-whitelist)$ VarFile
/var/spool/spamassassin/bayes$ VarDir
/@@{RUN}/spamd\.pid$ VarFile
# enable this if you run automatic rule updates
# !/var/lib/spamassassin/3\.002001/updates_spamassassin_org/[0-9][0-9]_[a-z]\.cf$
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