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I wouldn't worry too much. For the serial number to be useful in removing DRM would require access to your books. Blacklisting would require that someone pretend to be you. It would be purely malicious and I don't know but imagine that you would be able to remove the blacklisting by convincing Amazon it was not you that arranged it.
It is possible that you will have problems but very unlikely and there is not much you can do now in any event. Just forget it.
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