I just posted this a comment, but I thought I'd post it here.
A friend of mine ordered the engagement ring he wanted to propose to his girlfriend over vacation. He had it sent UPS (it was just the ring she wanted, and sorta unique so it was easiest to just order it). They propped it between the screen and the door of his neighbors apartment-who were on vacation for a month. It wasnt until about 2 months after he planned to propose that he ended up with a knock on his door and his neighbors going "um...we got this...". It was a tiny box, too, soo...on the bright side, he ended up doing a better proposal after all and she was more surprised then she would've been.
Oh, and he did do a charge back and stuff, so he had to call and repay and such, but it was such a lame situation.