That's really funny, it actually happened here in my workplace too! Someone put the expired chocs on the box supposed to be thrown away but the next day my colleague found empty wrappers in the waste bin... some one must have ate some! Wonder if they got sick or not...
The funniest part for me is living with two people with these exact opposing views on chocolate (though I suspect the one who is in favor of it being expirable is just doing so to justify eating the other's chocolate). I will have to show this to both of them.