http://consumerist.com/2012/07/06/i-...zon-wont-help/
On an Android device it it pretty straightforward to put your personal info such as your contact e-mail address on the lock screen in case someone honest finds your device.
On the Kindle you can set up a password but for what? I guess that would serve mainly for your own annoyance.
No similar solution for the Kindle to let the honest finder of the device let know of your contact details?