The sticker method was tried at a TARAS show a few years ago and worked well for the most part. The problem is that thieves aren't carrying animals out in containers, they're stuffed in pockets or packs and you'd need police intervention to search personal belongings etc.
With herp thefts at shows becoming so popular, I believe the lockdown display is the only real option. It may not be attractive, but you simply can't trust everyone.
I'm hoping the little maggots are caught and turned over and identified. Maybe if we introduce them to bats they will lose their affinity for stealing other people's reptiles...Preferably an aluminum specie of bat!