Oh sh*t!
I had no idea... in that case, any chance you can keep in contact with the police from the Netherlands on a regular basis? Call over to the SF police station and find some of the officers who patrol the city via bike and explain the situation, sound really sympathetic, and send them a link to this website so they can see a picture? Plus send them over a color picture of the bike so they have a full sized picture they can work with. Also, if you have a contact in SF you were staying with who's also an avid cyclist, could they go to some of the local bike shops and drop off some pictures of the bike?
I am really sorry this had to happen to you while visiting. Crap, that sucks.
Koffee