I knew about the black box but left it out of my comment because i still believe it's creation was to avoid the potential problems I mentioned. Given that no one has purchased a box, we don't know if it's safeguards actually work.
There were a of of other problems with the solar cell market (loss of subsidies, overproduction etc.) around the time the box was created and that could be another reason the Chinese didn't go ahead with its purchase.
BTW we should hear the results on the black wafer testing in the near future. It will be a major coup for the company if the Chinese show real interest; and that might get the attention of North American investors.