The aircraft is a Jetstar A320. Check the letterhead at around 1.48 - 1.50. Having said that, the baggage staff may well have been legitimately searching for something and do appear to be referring to letterheaded paperwork. Such things could be medication or travel documents that were inadvertently packed by the passenger and not kept out for transit. Medications are often packed and not deemed necessary by pax until the aircraft becomes delayed. I find it hard to believe that petty pilfering would have been filmed. Thieves tend be smarter than the average bear in my experience.