Ive sold my iMac - can I now unregister Logic Pro 8 so I can sell?

Ive just sold my iMac, now I need to sell my copy of logic 8 to recoup some cash losses. Can I unregister Logic Pro 8 so I can sell?
Im not sure if I registered it or not as Iv only owned for a month - is there a way I can find out?

If anyone can help asap as I need to sell sharpish.
Thanks>