We have something similar, the "Free Fridge." Unopened milks, juice, bananas, cheese sticks, yogurt, etc. are put on a cart & then go in there at the end of lunch. Kids can get in there after they eat their lunch if they're still hungry. It's also my first stop when I get a kiddo c/o a stomachache that says they didn't eat breakfast.
It still sickens me to see all the other food, that isn't prepackaged, that gets tossed every day. I applaud our food service director for trying to bring different things into the cafeterias, but there are certain things that almost ALWAYS get tossed by the majority. Not sure what to do about that. I tried to change our schedule to recess before lunch, in hopes of reducing waste, but no one is going for it at this point.