I just think this is kinda silly.
1. Mao is going through exams, like you did, Caramel, and I'm sure you know how stressful they can be, and how little time he has even to make such a trip to see you/go to the post office. Further, he might need to go back to China urgently, but perhaps after his last exam, he will work something out and get it back to you asap.
2. While you picking it up from him is a generous offer, I can kinda understand his reluctance to give out his personal details and since you're so upset..
3. You lent your notes to him, and you were being very generous. I know it's difficult not knowing when you'll get them back, but ultimately, if he says he'll return them, he'll return them. He won't have any use for them after exams (kinda like you now but it's yours) and keeping them will be pointless. I highly doubt he'd do that to spite you either.
4. I don't think you should have publicly revealed it was him. If only it has fueled arguments and like bucket said, it doesn't help the situation. If anything, it should make Mao feel angry that you would publicly humiliate him like this, over something that's between you two, especially over the internet.
5. However Mao, in the end it IS Caramel's and she did put a lot of effort into it. If you say you're going to return them, make sure you do in the end and in the same condition that you received them.
6. There's no point calling each other 'cunts' etc, in the end it'll just breed more hate making Caramel want her book even more, and Mao more reluctant to reply or make an effort.
This is just starting to get people to disagree with each other, when in the end VCEnotes should be about helping each other out. :\
And to everyone else who's like "give it back nownownownow", Mao already stated that he can't do that, for reasons that we (as people who aren't directly involved) shouldn't need to know.
And to everyone else who's like "CARAMEL YOU'RE STUPID", you wouldn't like losing something you put effort in, either.