I would bet that if a private individual bought the place, that you would have heard from them by now:
It is more likely that the house reverted to your Bank; they are notoriously slow on the draw.
It usually takes them 3-5 weeks to LIST it with their choice of Realtors: Then, the Realtor will come by and talk to you about the Cash-for-Keys, 30 days, and damaging the house.
If you agree, and sign their paperwork; your 30 days will start.
Good luck and may God bless