Just ordered an external DVD burner that I can use with both my laptop and desktop off eBay. Arrived today. I take it out of the box, and I hear a bunch of rattling, sliding, etc. Thought maybe a screw came loose in side or something, so I open the enclosure up. There are several metal like pieces floating around in there. When pieved back together they form a very tight oval type objet. Any ideas what the hell this is???