People do not take never materializing consequences seriously.
Well that’s also a management layer problem then. Those same people will steal supplies, falsify things and game the system every chance they get without competent and observant management.
I once worked for a company that made it perfectly clear that any form of theft or dishonesty would result in dismissal. They were a generous company in many respects and allowed their employees the freedom to do their jobs, but they didn’t hesitate to hold people accountable for breaking trust. The quality of management was as good as any audit.