Hi, thanks for using JustAnswer.com I am Cris and will be glad to assist you with your question. I am sorry to hear about your Kindle issue.
Unless you installed some third party app to locate your Kindle, no it can be located. However you can deregister the Kindle from your account. That will remove your Amazon info, remove books and nothing using your account can be installed onto the Kindle.
Use the link I have provided and sign in with your Amazon accont.
Click on the Devices tab, then locate your Kindle on the list and click on it.
You will see a "Deregister" link, click on it.
Let me know if you have any further questions. Please take the time to rate my service and submit.