I had a problem with a guy over a violin case that I got on eBay. I think it was like $18 or something ridiculous. I asked the guy politely about it, and he asked me if I was mentally retarded. I seriously considered just not paying him, and letting him give me negative feedback. The thing came in just about the worst wrapped box I could have imagined. It was like sheets of cardboard just wrapped up with mounds of tape. Like he got his 5 year old to wrap it. Imagine how upset I was when I realized it was a junior-sized violin case, and my violin wouldn't even fit in it! I'm still upset about that. In the end, I don't think I left him any feedback, since he did technically deliver as promised. Buyer beware. I'll certainly be more cautious in the future.
It's an unsettling trend I've noticed on eBay. It really seems to have attracted the scourge of the world. I used to never have any problems there, but now you really have to be very careful.
Some people use a "shipping service" whereby you basically just take your item to them and they wrap it and ship it for a fee. I think this guy used something like that. It was way overpriced, though.