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From: Richard M Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Recognize mbox files?
Date: Wed, 11 Feb 2009 15:59:09 -0500
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Cc: ams@gnu.org, cyd@stupidchicken.com, emacs-devel@gnu.org
To: "Stephen J. Turnbull" <stephen@xemacs.org>
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Xref: news.gmane.org gmane.emacs.devel:108990
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    A better idea would be for Rmail to detect whether it has already
    munged the file (a quick grep for "^X-RMAIL-.*" headers should do) and
    if not make the buffer read-only.

That sounds like a good idea.
It should be enough to check the first message for that header,
since a previous visit with Rmail will necessarily have displayed the
first message and put that header into it.