/usr/share/acl2-4.3/books/make-event/acl2x-help-test.acl2 is in acl2-books-source 4.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
(certify-book "acl2x-help-test" 0 t :acl2x t)