Sorry to hear this. Sounds like reading this thread that if it is your neighbors then they like to move at night. What is really disturbing is the fact that it sounds like your local police don't wanna be bothered with anything except such things that might glamorize them and get them on social media like You Tube highlight's/Facebook and such things.
I can't stand thieves!!! They are the worse, because the thing is that it's not about them stealing what might make them have a little cash, it's about them taking away what you can't put a price on like your master tracks that matter to you the most. I understand.
If your PC had WIFI then use your phone if you have a WIFI phone and see if it's broadcasting from your neighbors house. If so, call the police, that would be OBVIOUS evidence that they stole your stuff if they plug in and turn your PC on and it has WIFI. Should be more than enough for them to get a warrant and search their house for your stolen items.
Man I hope you get all your stuff back, especially your master tracks because I know how that is. I trusted this site to keep all my stuff online and put all my master tracks on there site and made some changes with my PC setup, then a PC CRASH and nothing was backed up ended up losing all my master tracks I had backed up online. Reason why was because the site shut down for good. So I know how it feels to lose all your hard work.
For me, I dunno, maybe it was a good thing, because the music that mattered the most was created by and from me, and I guess if it was meant to be then depending on what I choose to do, then it will either be lost or brought back to life by me if it so. So I guess you could say, I didn't lose memories with the music I made, I lost idea's because I am much more improved since then. But it wasn't a loss, it was more of a learning progress.
I hope they catch whoever done this to you. I don't ever use Craig List because there are too many horror stories I've heard on the news about such things, but I'll keep my eyes opened for the items you listed earlier in this thread. Best of luck man!!!