You really have to look after your belongings! I left my handbag on the rear seat when back in base (LGW) after the flight and went to the front for a few minutes. When came back my bag wasn't there. Eventually I found it in the toilet, luckily that cleaner (know that for sure) wasn't interested in anything but cash (I know it is still upsetting, but not as much as when someone steals something dear to your heart).
You would've thought that they would only hire honest and realiable people who get the access to the AC - how about security?
Scary...
Just look after your belongings , that's what I say!