It's not really clear what you mean by tracking. For the spheres to move and rotate you'll need to set their position and rotation, so you can keep track of those yourself. You can also get them from the gridshape object if you need to.
There is no standard physics engine in Max afaik, unless you count [jit.p.vishnu]. I don't recall anyone built or imported one either, but i'm sure people have tried stuff. Unless what you want to do is relatively simple or you really have a good idea about physics, I wouldn't press my luck here. I made your balls bounce: