Using PhysX without DLLs

Recently I learned that AC4 Black Flag uses PhysX. But when I opened game folder and looked at file list I haven’t found any PhysX DLLs. Does this game really use PhysX? If it does, how it doesn’t use that necessary DLLs?

The ‘free’ version of the PhysX SDK doesn’t include source, most like they are building either static libraries from the source, or incorporating the source into the codebase.