The key worked flawlessly. Just took a moment to run the sync steps. Actually comes from Chrysler. The address on the UPS package is:
Martin Harris Brubaker Chrysler Jeep, 1020-60 Lititz Pike, Lancaster, PA 17601 Its at the corner of state route 72, Looks like a regular dealership. Very odd. Bill

More info: It appears that some larger Chrysler dealers still have a Mercedes link. They continue to sell a Mercedes SUV and can get the keys. My local dealer seemed to know this but didn't say anything until I showed him howI got my key. Nice.