You can see much more info here:
The non financable notice means that there is something that makes the property unable to get bank financing.
Thus it IS cash only.
It IS occupied (per the infofrom above) and that will be the new owners problem - to make it vacant.
With that in mind, you will probably NOT be allowed inside before the auction.
Use caution, and attorney, run the title, inspect it as much as you can.