While trying to find the source of some annoying rattles coming from somewhere in the trunk, I found that my XTS (Sept.2012 mfg) has several components made in China.
My XTS has the optional donut spare. The aluminum wheel and donut tyre are both made in China and so is the jack.
Opening the fuse cover in the trunk, revealed that the fuse panel is also made in China.
At any rate, I never found the rattles and it'll be up to the dealer to hunt them down.
Any issues out there with rattles in the trunk area?