They probably wouldn't even know what they were for.
I see it as, if you can mod a car to make it better, why not mod an xbox to make it better?
And the guy that got his hard drives, pcs, and xboxs taken from him, and had to do community service and pay £750, he was selling the xboxs with like 80 games on them...
Unless you're doing anything like that, I doubt you'll get caught with anything.