I found this from google but don't know if they are the best.
http://www.uline.com/BL_5612/Laptop-Keyboard-Mailers
Oooh, good catch. I was looking at uline already for plastic bags to put around keyboards as another possibility. Some keyboards, while detached from the terminal, don't have a way of being disconnected from the terminal. So the best you can do there is put a bag around it to protect it. Also, you can still see the keyboard through the bag, so it has some "visible storage" display value.
Those mailers won't work for all the keyboards I have, however. They assume the depth of PC style keyboards which are never more than a couple inches. I have some keyboards that would require a box height of at least 3-4 inches and a VT220 keyboard is really quite wide -- like 22 inches. Still, this looks like it would be great for the ones that are more typically PC-ish sized. Thanks!