It's like that here. You can't have an unregistered car sitting in view for more than 30 days. As long as it's in a garage or fenced in, it's fine. If you buy a car for parts, you have 30 days to get what you want and have the remains hauled away. Beyond that, it's only if someone calls and complains about it.
Untitled cars can get a new title without too much trouble. You have a Police officer come and verify the VIN and then the VIN is run to see if it was ever reported stolen or has a lien on it. If it's all clean, the new title is issued. At least it's like that in this state (WI).
Those 3 cop cars look to be worth about $300,,,,,,,,,,,combined, and that's being very generous. Badly rotted out cars that look to have been sitting in the weeds for at least 20 years, what good are they anymore? The undersides are probably totally gone. Plus, they're 4 doors which have very little demand to begin with. In any case, the listing is "no longer available".