Buster,
They found it once the hold was empty as it was next to the webbing which by this time all the pax and bags were off.
Questionable calls were made but this was determined only after the benefit of hindsight. All procedures are being altered in conjunction with advice and help from the TWU and WorkCover.
Incidences like these high light areas of deficiencies in procedures and training. The bad thing would be if nothing was done about it them. This is not the case this time as a lot was learned and extra precautions are being put in place.