[FortuneCookie4]

I had the same situation that monitor was registered to someone else's but it was off. I said,  that I bought it from someone. Rep told me to contact that guy to unregister product. There was not any other way I guess, I had to leave this product.
After that incident, I have started registering products to myself (account) before I start next SE. Of course you need whole sticker where you can find all details they ask for and photoshop skills.

If I can somehow get ahold of the guy's full name, it could work. I found a sticker of the same model of monitor on ebay and I have all the codes.
The biggest problem then would be manufacture date and MAC address.

So yeah I guess it is a very long shot...