This file is indexed.

/etc/cron.daily/dpkg is in dpkg 1.16.18.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# Backup the 7 last versions of dpkg's status file
if cd /var/backups ; then
    if ! cmp -s dpkg.status.0 /var/lib/dpkg/status ; then
            cp -p /var/lib/dpkg/status dpkg.status
            savelog -c 7 dpkg.status >/dev/null
    fi
fi