But, we could have mail fraud on our hands here because they shipped us the wrong item.
It is not mail fraud. On the order page, if you look at the page with the "180GB" box selected, it actually has the correct part number in the details section, in addition to the 180GB box itself. It is only the title that has the wrong information.
Besides, there is no doubt that they would be willing to give you a refund if you asked for one due to the confusion of the title. That is not fraud.
Really what you are doing is knowingly trying to rip-off amazon for their mistake. There is a double standard here, since if the buyer made a mistake and ordered the wrong thing, no one would expect the buyer to be held to his mistaken order.