I recently bought the Rocket League Collector's Edition for my Xbox One and the four additional cars got installed straight away. However, when I accessed the garage, the cars from the included DLC packs were not there.
They are not in the Windows Store either, but the game case says they're included on the disc. I have fully installed the game, but the cars still won't appear.
Is my Collector's Edition disc incomplete or do I somehow unlock the cars in a different way?