Yes yes, you always have to bare in mind, that those guys breaking in cars are no rocket engineers, otherwise they would earn good money, engeneering rockets, instead of stealing our toys :)

And they are also ... in a kind of hurry ... when they break cars, so they are not going to check if they actually can use the stuff they steal, or if they damage it, they just rip it out ...
But they are still greedy, so maybe a note, giving them the opportunity to contact you without risk, will make them asking friends what an "E-Mail adress" is, and what an "anonymous Hotmail" is and so on ... like i said small chance but only chance.
TAKE IT WITH YOU WHEN YOU GET OUT OF YOUR CAR, this must become a reflex, like it is for me now.

Well well, that was my ~4 Pfennige ( around 2 cents ) :)

Nils