As an expert on this, Patrick, I am confused and this doesn't make sense. If there was a sheriff sale, and it really took place, your senior lien holder would now have a sheriff's certificate showing that they bought the house back, and they would have a price on there and they would also be able to tell you the redemption date. And that would be 182 days from the sale date.
For them to say "it went back to the bank" does not make any sense. So .....
Call your bank, ask for Loss Mitigation, tell THEM that you want to know the foreclosure status of your property/loan, and they will. That part will be simple. You may be transferred to the "recovery department" or "foreclosure department", or something liket that. But you will get your answer in a heart beat.