I started working in the 70s. Through until the 90s, I was paid in cash. The company didn't track which bill serial numbers went to which employee. That was

I started working in the 70s. Through until the 90s, I was paid in cash. The company didn't track which bill serial numbers went to which employee. That was the same for pretty-much everyone in Australia until the 90s, when we started to get paid directly into bank accounts. But, I worked at a bank at that time, and I can tell you that our tellers and ATMs didn't track serial numbers then either: we had no record of which bills went to which customer. And that was true regardless of your age, gender, religion, ethnicity, etc. I appreciate that this has probably changed since then, but ... that's kinda the point: it used to be private.