Sadly cars like RS models are often stolen to order by professionals who know how to defeat Tracker, which makes Tracker worthless in the opinion of many.
Cars are being stolen with keys because the factory immobilisers are really difficult to defeat, breaking into the house and stealing the keys (at knife point if necessary) is a risk that RS owners have to be aware of and accept. That's happened several times in the last year to RS4 owners on rs246.com
Having said all that I hope they do recover the car, and the scrotes that stole it get some painful treatment - it's what they deserve.