I don’t know that there is a defined policy stating how frequently you have to physically occupy the property or how many nights you ha e to sleep there - maybe you like to go camping a lot, or maybe you travel for work, but you do have to call the place home for a while...

Another way to own a non-Turnkey property , is to consider a Partner that lives in the subject area and is willing to help you physically. 

I have found a lot of potential properties around a new casino in my area.

Most of the time, people just mail to physical addresses.

How do I get the physical address from this? 

You'll never get the money but at least you get rid of him.This is why it's important to inspect every unit before purchase (including physical inspection, payment history, lease terms, etc.) and why you should have a reserve.

The previous owner still has all their stuff in there but they are not physically living there.

It is a good idea to:Spur them into action to redeem; and/orLegally gain official possession of the property in case there might ever be some dispute about whether you were physically in exclusive and continuous possession.

There has been a ton of buzz around the opening of two casinos in Atlantic City.

In other words, a digital copy of a physical original is generally enforceable, but not 100% bulletproof.That said, I’d suggest holding onto the physical originals that you already have.