Making objects grabbable [1.3.9 for unity]

How do I make objects grabbable?

I've looked at the ControllerModels scene. It has a bunch of cubes listed under an empty object structure called Grabbables. Each of these cubes has the OVRGrabble script and rigid body. 

There are the Quest Touch Controllers in the scene. Hwever, they don't grab anything. 

I noticed that nothing in the scene has the OVRGrabber script. Should this be on the controller? Where abouts, etc?