The serial number is on the original Kindle's box and under the rubber back cover.
Once you find the serial number, use kindlepid (1st step of kindlefix for MOBI to AZW) to convert it to a PID. Then use mobidedrm with the Kindle's PID to strip the DRM. I have never tried this on a periodical, but if they are AZW's it should work.
For anyone archiving Kindle periodicals on their PC, it would be a good idea to find the Kindle's PID right now and confirm that the PID and mobidedrm work on at least one ebook. You can check this by opening the DRM-free version using Windows MobiPocket Reader. Don't forget to store the PID in a safe place.
I don't know why so many newspapers and current events periodicals are fixated on DRM. Much of the material is on the web anyway and it has a limited shelf life. I just don't see piracy as a big problem in this case. One good reason to pay for a Kindle version is its search function and as an archive of complete versions for future reference. Since Amazon does not archive the master versions, the DRM makes old copies extremely fragile.
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