The Trash Mystery

In the appartment building where I used to live, recycling bins caused a lot of problems.

Where I live now, the weekly chore of taking my trash to the street is raising serious questions.

A few weeks ago, I found someone had used my trash can outside to throw away some kind of wire. I was unhappy because each appartment has two trash containers to use and I can't believe someone would need another. And if they did, I sure hope they'd be kind enough to ring my bell and just ask whether they can use mine.

So I took the wire out and left it next to the other containers.

Two weeks ago, I took out a small trash bag, thinking I had not taken my trash bag to the street the week before, so there was still a bigger green bag in my trash can that I could put the smaller bag into.

I went out; and there was no green bag.
Okay, so my memory was wrong.

But it happened over the weekend too, and this time I clearly remember there WAS a green bag in my container.

So it seems someone is not only using my trash container, but also taking my trash to the street each week. Who? And why???

This is mostly very disturbing, but also extremely annoying. Sure, I don't enjoy taking my trash to the street, but I don't like for anyone to do it for me each week because my trash doesn't need to be picked up each week - more like once every two weeks. And it irritates me a hell of a lot that someone would take my half-empty plastic bag to the street each week and contribute to destroying the environment in my name.

But what am I supposed to do?
I had put up a sign next to the recycling bin a few years ago so as to warn Grébiche she wasn't allowed to use it; but I figure putting a sign in my trash container wouldn't work...