Friends and relatives. There are also people who simply ask strangers. Or at other individual stores (not big chains, but really just a single store where you can meet the owner). It’s all about saving tax this way). Then they are a few euros cheaper. They are still packaged and sealed. They are the same price in every store. Alcohol is easy to get rid of when buying and selling and in individual snack bars on site. Perfume is also easy to sell.
Depending on the situation, you may also be given a list of things that the owner could still use. As I said, this works in small individual stores and they are happy about the tax savings.
https://m.youtube.com/watch?v=dI1bJmqsz8E Nothing is done against the masses and security personnel are not allowed to intervene. (Why do you have security staff in your stores if they are not allowed to do anything anyway?) So sad.