The Kits that ScoutNut is referring to are not the kits that I am talking about.
The Mackin Group kits are called "Deluxe Pinewood Derby Set" and say "Boy Scouts of America" across the top of the box.
When I talked to the person at The Mackin Group, she told me that they purchase the wood blocks directly from the Boy Scouts in Charlotte, and package them with the other items in the kit (all of which are BSA approved), under license from the Boy Scouts, and that The Mackin group IS officially licensed by the Boy Scouts for this, and the other products they sell.