Get a copy of the report they filed with the post office (and if it is truly was someone working in the post office who stole it, they should be getting the police involved) and copies of the money orders. 

If they have documented harassment or threats of violence, then you should instruct them to report it to the police and consider removing the offender. 

Then just take that polished-sales comps function, and run every new listing in your area through it, and you get what I called the Daily Spread Analyzer in my Page 1 reply.As for how to do CMA/Comps, it's as easy as pulling up the neighborhood on RedFin (ideally 0.25-0.75mi max), adding filters to match similar BR/BTH/SF Ranges, and then sort by Highest Price to Lowest Price.

He had just applied to the local police department.I had another tenant discharge a firearm in an upstairs apartment.

But even if crime mapping is unavailable I would recommend calling or visiting the local police department and having a talk with them about the safety of the neighborhood/block. 

Do we specifically call the police station?

If he vandalized the place file a police report.  

Denver for example bought hotels to house migrants and Denver Police responded to over 4,000 calls in the first 100 days at these hotels that have been now unofficially renamed the Trouble Tree and Meth Western. 

Just keep calling the police when there are issues. 

Pretty rare from what I see that cities allow or want this....turns single family neighborhood into multi family and most of the zoning people don't like this.Plenty of issues from their point of few of why they don't like it.....parking is one...now no one parking in garage, and potential for more cars...so now 3-4-5 cars in the street.More taxing on the water/sewer/trash/police/fire/city services.I wish you the best of luck with this.