I don't know if in currently user's existence can be checked via SEC$USERS.
Sooner of all no. SEC$USERS shows only users in security database, we can't check for win_sspi. And even if we learn all plugins to list users that check does not make big sense - we can't ensure that user granted some rights in database will not be removed from OS as long as that rights exist. Not to mention file-copying database from server to server.
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