Quote from @Arron Achey: it's hard to know what to do with the current renters without seeing evidence of the current condition.You have a phone with a camera and can take (almost) unlimited pictures.

Do you have exterior security cameras?

.:$200Carpet and installation: $330 Knowing what I know now, I feel that I could have had this all said and done around 2k.I will post some before and after pics as soon as I can get them off my camera (hopefully tomorrow).Next we'll talk about the buyer, sales price, the negotiation, and terms.

OR if that fails, hire a plumber that does sewer cameras or pipe locating, they will have devices that they can track...

The answers to dog barking, leaves falling, parked cars, surveillance cameras, cutting down trees, paint spray on new car, paint peeling, loose boards in fence, dog barking, etc aren’t the answer.  

Same tool, different results.Parallel this to a camera: A camera is a tool.

You may need to camera scope down your existing sewer line to see how deep and if it's feasible to connect to. 3.

I finally purchased a surveillance system,  and captured and recorded the tenant on camera stealing  a package.  

I'm not sure if I'm thinking too much into it, but do you use a newspaper or something in addition to your camera/phone to prove time stamped photos. 

@Enyi Ajoku Have an outdoor security camera system set up on the outside front & back of the property, as well as additional lighting.