I must have really atypical chickens!!
They never seem very bothered about corn - in fact when the come out in the morning they ignore their feed, which is cooked wheat, corn and peas, and scratch around. By the time I take their evening snack of sunflower seeds, mealworms and corn they have usually eaten all the "mash" I've put down in the morning. They fight over the mealworms , then eat the sunflower seeds and next morning they'll probably eat the corn. I cut some grapes in half but they had obviously never had them before and didn't seem keen.
it can be difficullt to tell what they have eaten as I leave them to it until they've gone to bed - but I get "steeple chasing" squirrels that leap through the elcetric netting, and they're out there before I've let the hens out so they may have had the grapes.
Oh well, I'm still getting an egg from Henny Penny!!