Cool.  Thanks for reporting back with a fix.

Problem solved. Someone mention checking the nuts that tighten the license plate in the back.  They were tight but left space for the lower part of the plate to move freely. I replaced the nuts for others bought at an auto part store. It was actually the license plate's lower part flying freely with speed and making the noise.  Nuts replaced, license plate cannot move anymore. The noise is gone. 

Problem solved. Someone mention checking the nuts that tighten the license plate in the back.  They were tight but left space for the lower part of the plate to move freely. I replaced the nuts for others bought at an auto part store. It was actually the license plate's lower part flying freely with speed and making the noise.  Nuts replaced, license plate cannot move anymore. The noise is gone. 

See if this video helps.     

I am old fashioned. I know manufacturing techniques are better today, but when I bought my Edge straight from the dealer, I had the engine oil changed at 1,000 miles and the transmission fluid completely flushed at 15,000 miles (my Edge is not AWD so no differential or I would have also changed it early.) 

It is bad rubber molding The crap just falls apart due to UV and heat. I know as I have an 08 Limited. At 1st it was an air leak I fixed with a length of vacuum line to hold the window in and stop the air leak. (Driver's side) 

If the noise you're hearing is coming from the back of the dealer, check for a TSB that applies to the rear differential.  Not sure if that's where your sound is coming from, but I do know there were some issues with improper oil levels or something similar that lead to failure.  The differential on my GF's vehicle was replaced when the dealer took delivery of it (used), so I'm assuming it was on the way out.  

To get your answer, a simple internet search will answer your question.   However, to repair the sunshade, you are going to have to remove the glass panel.  Are you up to the task?

First question that pops to mind:  Are you cleaning your rubber moulding with anything?  Any kind of chemicals, just water, windex, etc.?  Anything at all?   Something you are using may be degrading the moulding.

I suspect the tech just made a huge mess filling the transmission and spilled a lot of excess transmission fluid everywhere.  Shame on them.   As stated by 1004ron above, " Best check the owner's manual for the transmission fluid change interval. In extreme operating conditions such as towing etc. the recommended transmission fluid change interval is 30K miles, and for normal use 150K miles. "   The interval you have for transmission fluid changes depends on how you filled out your Maintenance Plan.  If you marked " Extreme Operating ", then 30K mile intervals is what your plan states, and therefore, per your Maintenance Plan, the dealership should be performing the change every 30K.   Personally, if you read the definition of " Extreme Conditions " in the plan, it pretty much defines what every day driving is.   As long as it is covered in your plan at 30K miles, then you are all set.  No worries.