People are always contacting us looking for templates to change the keyboard of their cash register whether it is a SAM4s or a Sharp. Here is a site that has several different models keyboard templates. Also if you can't find your model find one that is close and change it. Most often they are just word docs.
These templates allow you to customize every space including text and color. Then you can print as many as you need to or change as needed.
Here is the site cash register keyboard template downloads.