I'm sorry about your loss, and hope you get it back.
Unfortunately, your best bet is do do a little detective work on your own to try to uncover some leads. Most police departments are overworked and understaffed, so I doubt if they will put much efforrt into finding your car, because its just not a high priority crime. And with no leads or clues, it's basically just a dead end to them. Any information you dig up is going to be well worth the effort.
*Chances are, it was taken by someone fairly local, or someone that looked at it recently, so make a list.
*Can you tell if they drove it away, or if it was loaded onto/into something?
*Did you talk to neighbors, friends, business's, etc, within sight of where you had it?
*Are there any security cameras, traffic cameras, bank cameras, etc in the area?
*Check with any trailer rental places to see if someone rented a local car trailer in that time frame.
*Check out car shows, swap meets, and local bargain sheets.
*You have a couple of distinctive features, like the mismatched dash pieces, that most people will overlook and will not change, so keep your eye out for those things, even when you look at cars that are a different color.
*Ask the police if there is anyone in the area that has a record of this type of thing.
*Go to some bars, and ask around if anyone has some Challenger parts for sale, or inquire if anyone knows someone that recently got a Challenger. Lowlifes like to brag, especially in the bars, so keep your ears and eyes open.
Whoever took it will probably not be stupid enough to sell it the way it is, so it will probably wind up being rebodied and repainted, or parted out. If they rebody and repaint, they may just decide to keep it, and show up at car cruises, so once again, keep an eye out for distinguishing features like the dash pieces, steering wheel, etc.
I would like to offer two stories that happened to friends of mine and how they were instrumental in the solution to the problem.
1. A friend of mine had a car stolen a few years back. He talked to practically everyone that he knew within a five block radius, and within a week, found out that it had been taken by someone only a block away. He called the police, and by that time, they had the drive train pulled, the VIN tag removed, and who knows what they were planning on doing with it.
2. A friend of mine had his identity stolen, and went through H3LL for several months. Then, one day, a snowmobile dealer called him up, and accused him of buying a snowmobile with a bad check. My friend explained the situation. The snowmobile dealer was really PI55ED, because the snowmobile that the guy bought was a real high end racing model and he was out a big amout of money, so he decided to do something about it. He remembered that the guy picked it up on a rented trailer, so he went to the local trailer rental places, and found out if the same guy rented a trailer. He found where the trailer was rented, so he got the records pulled for that specific trailer, and found out how many miles had been put on it. He divided the mileage by 2 (for a round trip because the guy returned it the same day), and plotted a circle on a map. He then began going to bars along that circle, asking if anyone knew anyone that owned one of these special snowmobiles. Finally, after a couple of weeks, someone in a bar told him that he knew of someone who had gotten one of those special snowmobiles. The dealer drove by the address, and recognized the guy. He called the police and got the snowmobile back. Then he called my friend, and gave him the information so that he could press charges. Not only did the dealer get his sled back, but he caught the guy that was making my friends life miserable.