The thick orange line in the above picture is my best guess as to the direction the sunlight is coming from. I was trying to be as generous as possible, I do believe that the line is actually too far counter-clockwise to the actual direction, but for the sake of argument, I put it where I did.
The following picture is of three tall buildings on the south side of Magnolia Lake, part of the President Country Club. The tall buildings give us a wonderful opportunity to see what angle the satellite is at as well as a strong shadow to determine the direction of the sun. The thin orange lines extend from the building along the shadows - the sun would be in opposition to those shadows. Even trying to be generous, there is no way to match up the highlight on the object vs the direction of the sun as indicated by the shadows.
It isn't a silver M&M up in space, it isn't an alien object, it isn't anything other than a manipulation of the image after it was taken.
There is another one (more matching with the solar direction) along the Florida Turnpike just north of the 710 Bee Line Highway. Where there are two, there are likely more - the position of the second one leads me to believe that neither are there to cover up any particular location. Graphics used to help line up the photos? Doubtful but remotely possible. I'm sure that Digital Globe has some explanation, one or another, that someone can squeeze out of them. :)