Open your CC in S4S and then under the "Meshes" tab you can see the Polycount of everything. It will be listed as Vertices and Polygons.
Vertices are the points that connect the faces, Polygons are the faces, Vertices don't matter.
It will show as LOD 0 (High Level of Detail), meaning if you are playing on Ultra or High graphics settings, this is what you'll see
Then there's LOD 1 (Medium Level of Detail), again this is what you'll see if you play on Medium Graphics settings
Some objects also have a LOD 2 (Low LOD)
CAS Items typically have 4 LODs
