Sounds like you need a better estate attorney.... Banks don't take or own the house when the reverse mortgage borrower passes away. The heirs own the house, but must repay the the balance of the loan as well as the taxes, insurance, etc. This is often done by selling the house, but if they chose to keep the house, there are options. Either way, as soon as mom passes away, the house (and the debt from the reverse mortgage) belongs to the heirs. There is nothing preventing you from going to the house and taking anything you want from the house. It's YOUR house at that point. Further, the loan is a "non-recourse" loan meaning that the bank can ONLY look to the property for repayment of the loan. That is, if the loan amount is $100,000, but the house sells for $90,000, you are not responsible for the difference of $10,000. The bank can file a HUD claim to try an get it from insurance, but you are not on the hook.
Where are you getting that the bank took the house and all the contents???