Oh sh*te. Makes you wonder if they're cruising forums, to know about it that quickly after you bought it
Possible, but probably just a coincidence.
When I had my ST taken, the little chavs took a high spec beemer and a hot A3 on the same night - they just spent an hour or so going round 3 towns near each other looking for the "best" cars with houses they could get in to. Doesn't take long to find an interesting car if you've got a bit of patience.
My lesson: Always lock your front door with a key. I hadn't, and it was a plastic front door you can come through the letterbox and open from the inside. Doh.