Exactly! That's what happened to me, they broke in to see if it was in the glove box, and them (once in the car) did a quick sweep of the whole car, boot included.
Luckily I only lost an amplifier that time, but still a major pain in the ass.
After I went for a stealth install (looks like no stereo at all) - no problems.
Mind you on the TT I've now got the fold-down flap, so still no problems.
Paul.
Paul Haigh, Reg. 4120
(mk1) 6GB, Blue, 00254
(mk2) 12GB, Red, 00357
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Paul Haigh, Reg. 4120
(mk1) 6GB, Blue, 00254
(mk2) 12GB, Red, 00357