No, only a confluence admin can see all restricted pages automatically. However, a space admin can remove restrictions from pages: https://confluence.atlassian.com/doc/page-restrictions-139414.html and then see them, but then it will be obvious that someone did something.
There is an addon that reveals all the secrets of Confluence permissions and restrictions: https://marketplace.atlassian.com/plugins/hu.metainf.plugin.confluence.ultimate-permission-manager/server/overview
It allows you to verify who can or cannot see what (spaces, pages, restricted pages) and understand the "why" as it gives you detailed explanations of direct or indirect permissions effective in the system.
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