We are using hard money to purchase a home and the seller asked me to send them Proof of funds from the Hard Money Lender.  

When someone has an "all cash offer" for an investment property, I know it's not really "green cash," but is it in the sense that an investor is paying for a property in full from the proof of funds in their account?

"There's the proof we need.

**with Covid I would recommend obtaining dated proof of rental payments from previous owner with tenant inheritance.

If you have some kind of proof of the drug use/dealing you should be able to get them out with an emergency eviction.

Lenders care more about credit history and current proof of income than past income and what you were doing to get it.

When you send it you need to include proof that the tenant gave you permission to make inquiries. 

You will want to have your financials prepared for the prior 3 years, to include proof of all your ongoing expenses, the capital improvements you have made, and a narrative that shows where the potential upside exists. 

When you hired him you should have received proof of insurance AKA a COI.

"In writing means communicated in written form with proof of receipt" which means also including any method that you can proof in digital, based on my knowledge.- realtor not a lawyer, formal expression please consult lawyer