Those of you that have opened bags of dry food that your cats will not eat please check with a local food bank. I pick up pet food from a very large rescue and delivery it to several food banks. Sometimes the bags have been opened, sometimes they have not, sometimes the food has been divided into one gallon ziplock baggies with the name marked on each baggie, ex dog food renal, puppy chow, cat food complete.
Food banks have a lot of clients with pets and I think they would welcome your donations.