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The simplest thing is to sign into the device using a different account. Just create an account using a dummy email address. Kobo do not validate it.
There is also discussion here about bypassing the registration. Because of the above, it never seems worth the hassle. A search will find it.
And, from memory, you can do the archiving books quickly from the Kobo desktop application. That allows multiple selection and you can select all and do the archive.
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