How to track a simple wireframe box...its not working bec frame is empty.

If you have a rendered movie of your Power Conditioning Equipement with nothing else in the shot you might be able to use Camera Tracker to create a virtual camera that you could use to add additional 3D layers to the shot that you could use as labels or pointers. 

If the 3D model of the Poser Conditioning Equipement has already been placed in a virtual scene with other objects, Camera Tracking is not going to work. You would need 3D object tracking and that is not possible with the standard set of tools available in After Effects.

Here are a few facts that may help you figure out a solution to your problem. First, perspective is controlled by camera position. Framing is controlled by focal length. If you have a 35 to 300 mm lens on a camera, and the camera is 10 feet from a box, the perspective you have will not change as you zoom in and out on the box. The vanishing point will not change, the parallas will not change, unless you move the camera.

Knowing that, if you have an object that you cannot track in a scene you could create a Camera and a simple 3D rectangle that has the same propotions as one of the sides or the bottom of your power conditioning device and then line up one edge of the rectangle sith the edge of the box and move the camera closer or farther away from the rectangle until the perspective matches. You will have to modify either the focal length of the AE Camera or the scale of the 3D rectangle layer to keep the size consistent and just fiddle with camera position until the perspective matches. I do this all the time using a simple expressions on layer scale. When you get the camera in the right position, you can then parent the 3D Redtangle to a 3D null at comp center and then set a few keyframes to reproduce the movement of the object in the scene or the camera. 

Without seeing the actual shot you are working with, or at least a similar shot, it's pretty hard to give you the most efficient workflow. I use a couple dozen completely different workflows to insert virtual 3D elemts, like the labels you describe into scenes. The workflow always depends on the shot. There is no one workflow that works for every shot. 

It would be super simple to just re-create the cube in AE inside a pre-comp and rotatet it in a parent comp.

Mylenium

If you have access to the 3D file, you can do another render that includes the artwork you want to place on one of the faces.

If all you have is the rendered video, the only option I can see would be to use Mocha AE to track translations on all four corners, then take the four tracks to attach them to a Corner Pin effect applied to the text layer. No 3D data is going to be gathered from the wireframe.