Here are a few sample messages (please review with the legal team before using):
You've requested a page, either by typing the URL directly into the
address bar or by clicking on an out-of-date link/bookmark that is not
available. Please visit the other areas of our web site.
This page cannot be found. The page you are looking for might have been
removed, had its name changed, or is temporarily unavailable.
Our apologies, the page you requested cannot be displayed.