Organizing Keys

You know all those keys that you have been shifting around from drawer to drawer year after year that have no identification? If you absolutely have no idea what they belong to it might be time to let them go.
Go through you house and match up all these miscellaneous keys to every single lock and door knob you can find. Also make a master list of all the locks so you know how many doors require a key. If you still have keys that don't match at least you can rule out your home. Next make a list of other places they might belong to. Did a friend or relative give you a key to hold onto? Are there any other buildings you have access to? Continue to test out all of your keys by process of elimination. Any keys they don't belong to anything should go. If you still are not sure about some of the keys, put them in a container and store outside of your immediate work area.
In the future get rid of keys as soon as you know they are no longer needed. If you have a lock changed take the key off your key rings immediately so they don't get lost in the shuffle again. If you are moving make sure you leave all of your keys behind you will not need them anymore.