You should be able to go back to your original Bankruptcy filing paperwork and the property should be listed. If it not surrendered and you have been making payments to the mortgage company then they have to verify.
what is the lender requiring? is your mortgage reporting to credit?
If you need further assistance feel free to reach out to me, I am one of the senior mortgage consultants for Gustan Cho & Associates: Maria Windham 813-352-7523 firstname.lastname@example.org