I just got the XT my Mom ordered for me. The battery is charging, but I have a question for other XT owners. Should it have a rattle sound? When you move the body around, there is a rattling sound. I'm not sure if it is normal for this model, or if it is something I should be concerned about. There is nothing that I can see loose in the camera. I removed the body cap, and opened the battery compartment and don't see anything. I won't be able to fire it up until the battery is charged, and see if it works properly. Am I worrying over nothing? It was bought from B&H, a grade 10 used. There is a refurb sticker on it. I've never had a problem with refurb anything, so I don't know the best way to proceed. Any advice?