"To a degree that surprised us, our attacks benefited from testing on the device itself. Our first
attempts at implementing a new attack strategy were often visible to the scanner, and reliable concealment was
made possible only by iteration and refinement.
[...]
The effectiveness of such a strategy depends critically
on the difficulty of obtaining access to the machine. In
addition to the device we purchased, at least one other
Secure 1000 was available for sale on eBay for months
after we obtained ours. We do not know whether it sold, or
to whom."
If the attack you are worried about is terrorism (which I imagine it must be, since that's the thing these things purport to stop, I suppose), then I don't think this is a big problem. Terrorists get about as much bang for their buck whether or not they get caught, so they can presumably just try out their strategies a few times and see if they get caught.
"To a degree that surprised us, our attacks benefited from testing on the device itself. Our first attempts at implementing a new attack strategy were often visible to the scanner, and reliable concealment was made possible only by iteration and refinement.
[...]
The effectiveness of such a strategy depends critically on the difficulty of obtaining access to the machine. In addition to the device we purchased, at least one other Secure 1000 was available for sale on eBay for months after we obtained ours. We do not know whether it sold, or to whom."