I saw a review or two about Oxford that they post fraudulent listings. 

We sometimes list on Craigslist when we're desperate or to combat the scammers.

That means you intend to purchase the property with cash, and so if you don't have the cash you made a fraudulent offer. 

If the key to fighting COVID-19 virus, is pure water, used to wash it away; then only certain parts of the U.S. still have pure water supplies, to be used in combatting this virus.

Of course, that is not always true, but with that viewpoint, I would talk to the broker first and ask him what is going on, why he presented a falsified LOI from the bank.If it truly was something underhanded and/or fraudulent, then I would imagine you have an easy case to get out of any agreement you have.

The young, unkempt, male tenant became combative and aggressive when asked about the usage of my parking space.

To combat the aging plumbing I'm having my plumber re pipe both duplex's with Pex A but am thinking since he's doing that anyway I might as well have another water meter connected at each property so that I can begin offsetting the water cost to the tenants.

If you suspect the person is not a licensed agent and plans to keep the money fraudulently, you can pursue legal and maybe even criminal action.

The bad part about it was that I saw the first fraudulent deed taking the property come through and confirmed with the grandson of the elderly owner that it was in fact fraudulent.

I'm sure they will approve it - and would be hard-pressed to deny it unless there's something potentially fraudulent going on (which it doesn't sound like it!)