It was stolen before the current owners bought it, along with all the copper wiring and plumbing.  

Some of his stuff was stolen: XBOX, guns, etc.Any quick advice on what to do?

I would keep the PO Box for my business mail, that way if you decide to do something different with that space, you're not constantly changing your business address, plus I personally do not want my business mail and checks coming to an address where it could easily be stolen or wind up in a nosy tenants box. 

It was very disappointing to finally think I'm buying, then have the deal stolen from under me!

If materials such as tiles are stolen from the home, the cost would not be covered in a traditional homeowner's policy for the home you live in.As the investment project progresses, the insurance needs also change.

Legally you have stolen their money.Everything will be fine until it isn't and if that happens you will have serious regrets.

., AC units stolen, pipes and wiring ripped out, window broken, door kicked in), significantly more challenging tenants, and neighbors whose actions reduce your property value (e.g., building code violations, drug activity, squatters, loud music, loitering, littering).

Not only that, but I waited to check out references, and turns out they have stolen from several other investors.

It's nothing than a potpourri of stolen ideas sewed together with fairy tales.

I have a very strong and successful background in Real Estate, Fleet Renewal, Visual Merchandising and Entertainment.