I had one of these nicked as well when the car was only a month old. Unfortunately, my mrs was forced off the road by a fast oncoming car (overtaking on double solid lines) and kerbed both nearside wheels badly. We took it to our local tyre dealer to check the tracking which is usually £25 but they said they were unable to help as the car was so new they did not have the info on their computer for the four wheel laser alignment. Took it to our local Lexus stealer where the tracking check cost a whopping £79.95! It did not require adjustment and he said he had reduced the price for us! What?
Anyway, back to the missing dust cap. Next time I washed the car I noticed they had fitted one, so that was why the tracking was so expensive!