You cant stop it, you cant just expect people to just ahdere to your honor system?
Imagine someone in some poor country and they have no skills but they see theres beer token they can take, to them the fact that you havent secure those tokens down is all the proof they need that they need that money more than you.. its not right but its how they will justify it so dont expect people to just respect your opened door and unlocked safe full of money ....

its called the tragedy of the commons
https://en.wikipedia.org/wiki/Tragedy_of_the_commons

The tragedy of the commons is a situation in a shared-resource system where individual users, acting independently according to their own self-interest, behave contrary to the common good of all users, by depleting or spoiling that resource through their collective action. The theory originated in an essay written in 1833 by the British economist William Forster Lloyd, who used a hypothetical example of the effects of unregulated grazing on common land (also known as a "common") in Great Britain and Ireland.[1] The concept became widely known as the "tragedy of the commons" over a century later due to an article written by the American ecologist and philosopher Garrett Hardin in 1968.[2] In this modern economic context, commons is taken to mean any shared and unregulated resource such as atmosphere, oceans, rivers, fish stocks, roads and highways, or even an office refrigerator.