Sorry, I forgot to add:
In reference to your last post, they can be rekeyed. In the bottom of each shackle hole is a screw that can be taken out to remove the bottom plate to get access to the lock cylinder. Some times they get covered in rust and looks like they are not there. Simply spray a bit of of your favorite cleaning/oiling/degreasing liquid down there and let it sit a few minutes then flush it out.
If if is an AVA cylinder PLEASE BE CAREFUL when taking it out. Mixing up the disc tumblers? is very easy to do and very time consuming to fix.
I have pictures of a gutted one if you are interested.