CAA no longer issues Carnets. As of December 2015, they can be obtained via Boomerang Carnets:
If you’re a holder of an existing Carnets, upon it’s expiry, that Carnet must be returned for discharge to CAA National.
500-1545 Carling Avenue
All replacements cards must be requested from Boomerang Carnets.
More information on Carnets
The FIA Carnet can be thought of as a passport for your car. It offers a promise/guarantee to a foreign government that the vehicle identified in the Carnet, if granted temporary importation status for tourism purposes, will be removed from the country within the time limit imposed by the respective jurisdiction.
Using the Carnet is an alternative to leaving a cash security deposit with a foreign government. In the event that the vehicle is not removed within the imposed timeframe, the country may claim from the issuing organization all duties and taxes that would be required to permanently import the vehicle to that country.
A carnet allows free movement and unencumbered access between many foreign countries. Most countries, but not all, allow this option.
A Carnet is valid for one year from the date of issue.