Copies of receipts for materials and paid bills for labor are evidence of value, but not essential.

My valuation shows negative cash flow.

If cash flow is more your focus, consider multi-families in Dayton and Cleveland, where you can see cash flow rates of 10-18%.

If you buy a property for 100% cash, it's virtually impossible not to cash flow, so I assume you are financing everything.

Post-scarcity refers to a hypothetical future where goods and services are so abundant that they become essentially free, leading to a fundamental shift in how society functions.Some experts believe that certain sectors, such as information and digital goods, are already approaching post-scarcity due to the ease of replication and distribution facilitated by digital technologies.

There is the potential (again depending on how often he does his books) - that he literally did not know there were concerns on the cash side of things. 

Because I have cash to close; because I ALWAYS protect their commission/fee, and because I alway do what I say.To earn the kind of numbers the OP is anticipating takes ALL of the following1.

The Midwest might be worth a look—it's affordable and offers great cash flow potential.

So I can cash flow with less rent.   

The area I invest in produces good cash flow and good appreciation as well.