Looked at that too, but since unless I am missing something, that appears to be in the captain’s cabin based on linked document from the parent of this comment

Looked at that too, but since unless I am missing something, that appears to be in the captain’s cabin based on linked document from the parent of this comment thread; which means it would not only be hard to access, but once placed, very likely be hard to recover and would have been checked too, likely even in flight while the audio continued to be heard.