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If you delete a page from your site, and that page is indexed in google, google will preserve the PR of that page and it will check for its existense a long time from the time it was deleted, even if the page will not apear in search results. I deleted a subdomain 2 years ago, and after 1 year i reinstate that subdomain. All the pages reapear on google at the same position for their respective keywords. If you want google not to check for the existence of the deleted files, you should sent a 410 response, not 404.
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