I'm terribly sorry for your lost device, and thanks a lot for considering Prey at this difficult moment. Unfortunately, Prey can only help you in case it's already installed and configured on your devices, prior to loss or theft. If it isn't, then it's impossible that it can render any result. This is not limited to Prey, but it applies to every tracking app out there.
For now I can only wish you the best of luck, and recommend you to install Prey on your other devices. That way we'd be able to help you in case the worst happens again