These keys are not destroyed when you use them, but you'll need more and more of them to open the chests that contain the best stuff. There are 25 silver keys and 10 silver-key chests scattered throughout Albion.
So if you can tear yourself away from kicking chickens long enough, you may want to check out the following silver-key locations. These exist in the form of silver keys that are used to unlock special reward chests throughout the world. With so many side quests and events taking place that can sway you toward good or bad, you may forget that there are hidden items scattered throughout Fable.