The police are very busy.

Maybe call the police that is flat out theft in my eyes

Hey @Andrew Pappas,Call the local police precinct and ask for a crime report for the address and the street generally.

You have a police report indicating threatening behavior.

I told our tenant to call the police but otherwise stayed out of it.However, if limiting the number of times having guest were not legal there is not much to be done because I assume @Russell Brazil is correct about the apartment not being allowed. 

Your property manager is NOT the police. 

If he is planning to meet someone and get cash, he could meet me, and the police... not sure the police would care or entertain doing something like this, but why not ask.Any other suggestions in case I find the "rental company" and can reach out?

One day while in retirement they were all out fishing but waiting for them at the shore were police with a warrant for their arrest for negligence, do not become on of these kinds of flippers.

The police knocked but (surprise!)

And if neither decedent had a Will, you'll need to locate the descendants of any deceased heirs as well.