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Not only is receiving stolen property unethical, but it's also a crime. Depending on the value, it could even be a felony. By publicly posting that you knew it was stolen, you blew your one defense of ignorance.
Your second mistake would be receiving a laptop that could potentially be equipped with LoJack. LoJack claims a 90% recovery rate, and knowing as you have stated that the laptop is stolen, are you really ready to take that chance?