We live opposite some glass containers, and we regularly see people, with special sticks, retrieve bottles from these containers. At first, we thought these were homeless (or just poor, or perhaps just very bored) people who wanted to gather bottles to collect the 'vidange'/'statiegeld'/'money the grocerie stores give you if you return certain types of bottles'. But they also take bottles for which you can't get 'vidange'/'statiegeld', and in addition, quite a lot of them don't look particularly poor.
Does anybody have any idea that would go towards solving this mystery? Anybody ever noticed something similar? Anybode ever followed them to their secret hideout?