The oldest known codex?

CODICOLOGY: Papyrus fragment found in Egypt could be from ‘oldest book ever discovered,’ experts believe. Scribbled calculations for beer, oil taxes date back almost 2,300 years (Arab News).

This article summarizes an article in the Times of London that is behind the subscription wall.

By "oldest book," the article means the oldest "codex" that is, a book with pages bound inside a more durable cover (as opposed to a scroll).

For more on early history of the codex, see here and links and here.

UPDATE (28 June): More here.

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