/usr/share/acl2-4.3/books/add-ons/hash-stobjs.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 2 3 4 | (ld "hacking/hacker-pkg.lsp" :dir :system)
(ACL2::CERTIFY-BOOK "hash-stobjs" ACL2::? T :TTAGS ((HASH-STOBJS)))
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