I'd be wary of this - if someone were to claim their ST lost at this stage of the season they just get issued with paper tickets, they could then sell their genuine ST card to someone who would be none the wiser until they turn up to the gate and it's been deactivated.
Blanchflower, that's a great point, thanks. I don't suppose there is really any way to prove that is not the case either. The search continues!