The surface tests show that the baseplate is slightly convex, the center is a bit higher than the outside. On the surface you can see small milling marks. However, contact tests later on show that the contact is very good, so nothing to worry about here.
A closer look
The cooler's casing is made from plastic which has a metallic paint job.
If you look at the two empty holes it seems that Evercool has designed this cooler to be made into a new version which has four heatpipes.
These aluminum fins are dissipating the heat while the fan is blowing air over them.