Brian, I hear you, the kids nowadays, just don't seem to know how to act in public. A remedy to having your puzzles dumped, is to covering your puzzle with stretchable plastic wrap so they can't be disassembled. If a person wants to try out a puzzle, have a sample one that they can work with. I never had my puzzles played with, they were all wrapped in plastic or they had a plastic bag over them. Having them protected that way didn't seem to affect sales, and it made it a lot easier to transport them.
Len