Update: I fixed the collision box not following the golden cube BP_Pickup, the issue was derived from the shape/material being assigned to a subcategory of BP_Pickup under “Static Mesh” rather than being assigned to Static Mesh.
Once the golden cube was assigned to static mesh, and the simulate physics box was ticked then the “hitbox/collision box” would follow. Essentially it was a placement or folder problem.
However now the only issue that remains is the TargetPoint, for spawning a golden cube, creating duplicate cubes upon play.