I would provide a physical copy, email, and even a text/pic for the lease violation.

But, if things go well. so far, i've heard from my brother that the owners of the property we are aiming for, are being difficult and wanted us to make the offer before looking inside the physically looking inside both the units of the duplex. 

In many cases it may be physically impossible. 

However, as you stated, Memphis can vary significantly by street, so I recommend visiting the area personally and observe the specific streets and surroundings, or doing a zoom call with a trusted realtor who has physically been there. 

Instead of using the check scanner and scanning the physical checks individually. 

You would really have to interview the brokerages - physical and virtual.

I called the police and they say the theft is only civil and I have to go small claims, and the threats aren't criminal because its not physical violence. 

It's important to note that this isn’t a PO Box; it's a mailbox that provides a physical street address.

An easy way to find those properties is to compare mailing address to physical address.  

Nor can your rental agreement state that the landlord can remove the tenant's belongings and put them on the curb or in a storage facility.If a tenant refuses to leave your property, the only legal way to have them removed is to file an eviction action against them, obtain a judgment of eviction, and if necessary involve the Sheriff's Department to physically remove the tenant.