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Your best bet at seeing if you can get the information you seek will be to try to contact Adobe Support thru chat. Since the software was not purchased thru Adobe or an affiliate, and is possibly a member of their 'no longer supported' status, they might not do more than tell you that.
Chat support - For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat option...
Serial number and activation chat support (non-CC)
http://helpx.adobe.com/x-productkb/global/service1.html ( http://adobe.ly/1aYjbSC )
Shopping for older Adobe products is always a gamble... and best avoided since it involves third party vendors with no ties to Adobe.
It is not clear to me what you mean when you speak of registering because what you describe the result was sounds more like a redemption code was involved... unless the software installed and activated properly but when trying to register it was indicated as already registered as you say... but I think I have been able to re-register any time my installations got flaky and asked for it to be done again. Redemption codes can only be used once... they are used to acquire a serial number. The serial number is what you use to activate the software. Serial numbers can be used more than once but are limited to being in use for only two machines at any given time.
Thank you for the reply. They are assisting.