Even just going to the Apple Store when you're in NYC for someone and bringing back a brand new Mac can get customs officials interested.

I'd be hesitant taking anything from anyone, even a child handing a letter to be postmarked in Florida.

Yeah, but bringing back a brand new Mac that I personally bought at an Apple Store for a friend won’t ever land me in jail - worst case scenario is that the friend would have to pay me back for whatever import duties the customs officials levy on the computer.

Now, carrying a random package from somebody on the Internet? There are more productive ways to get into jail than this!