Washington Unclaimed Funds Re: Unclaimed Property How Does My Husband Prove The Account Was His?

Re: unclaimed property How does my husband prove the account was his? - washington unclaimed funds

We discovered that my husband has a bank account in our home state unclaimed property (Washington) has changed its name as a teenager and asked for proof of his identity and that we provide. Now they want to prove that your account is a statement or deposit slip. The count is 35 + years! Does anyone have any suggestions? Thank you.