/usr/share/acl2-7.2dfsg/books/meta/meta-times-equal.acl2 is in acl2-books-source 7.2dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | (include-book "cowles/portcullis" :dir :system)
(include-book "std/portcullis" :dir :system)
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