Cookies are usually written by JavaScript code loaded by the web pages. Have you tried to look and see if any of your web page headers or recorded resource files, the .js files, have JavaScript writing the cookies? The function usually contains 'document.cookie' somewhere in which the cookie gets written to the browser cache. If you can find that it'll put you on the right track to figuring out from where you can correlate the content of the cookie. If the JavaScript code isn't in the web page itself start looking in the rousource files.
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