It's not that it's older. It's that the top part of the food has changed color and some of the jars have changed color and others haven't. The contents thus far are salsa and spiced peaches.
The main concern is that these jars weren't hot water bathed and most of the lids have either popped up, or were never properly sealed in the first place.
I don't wanna mix it into my feed, just use the liquid from the bottom bucket to alter the microbes so that it's safe to feed the chickens.
Oh...got ya. I'd dump them without thoughts of trying to change their nutritive or pathogen levels....if the chickens eat them from the compost pile, so be it. Never had a chicken die yet from eating old dumped canned goods.