There's several of them over at google 3d warehouse.

http://sketchup.google.com/3dwarehouse/search?q=xbox&styp=m&btnG=Search&reps=2
They will, of course, need to be converted to be usable in Poser. I simply downloaded the demo version of SketchUp Pro which gives you 8 hours you can use any time. I only use it for converting and have converted several hundred and still have almost four hours left.

There are some at TurboSquid as well. (http://www.turbosquid.com/3d-models/3d-model-of-console-gaming/372707)

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