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2024-03-27: If the First Archived Copy by the Wayback Machine is 404, When did the URL First Exist?

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  Figure 1: TimeMap for the URL https://twitter.com/elonmusk/status/1675187969420828672 On July 1, 2023, Elon Musk posted a tweet that was archived multiple times by the Wayback Machine. Figure 1 shows a representation of the TimeMap for the URI-R (URI of the original resource) of the tweet. Each timestamp shown indicates the time, or Memento-Datetime, when the URI-R was archived. In this interface, the color of the timestamp indicates the type of HTTP response that was received at the time of archiving. A blue timestamp indicates an archived HTTP 200 response (the URI-R returned the expected result), a green timestamp indicates an archived HTTP 302 response (the URI-R redirected), and an orange timestamp indicates an archived HTTP 404 response (the URI-R was not found). Each timestamp links to a URI-M , which is the URI of the archived webpage, or memento. Typically, we can take the first appearance of a URI-M in a TimeMap as evidence that the URI-R existed at that Memento-Datet