I don't buy oranges from the store. A truck from Florida comes our way once per month, each month has a differant orange that is in season. They ae all very orange and taste great andI have had some last 2 months and still taste great. If left alone with plenty of air, they dry well like any good fruit should.
The crap you buy in a store will mould/rot in time and can be from anywhere in the world. Once the truck stops coming, I have had enough oranges till next year. I normally eat $800.00 worth of oranges. They cost about $18.00 a box.