Another explanation is that such carelessness was a form of willful blindness. If Gox had cratered (relatively) silently then perhaps the coins would not have been 'found' until much of the fracas passed. But because legal process has been invoked (bankruptcy, IL class action) the penalties for not doing a clean-up now go beyond negligence and could result in contempt or a loss of liberty. So there's additional incentive to look harder at this stage.