The USPS is the world’s largest drug mule in existence. Ever in history.
They even announced a few years back they don’t look for weed, they just want you to get your package as quick as possible.
Good people, that work year round rain or shine. In a large organization, all they can do is attempt to limit theft, which is why they tell you to package it better ha.
humans are humans and there will always be thieves.