A bank teller took $10,000 from a dormant bank account because his daughter was really sick and she was going to be in the hospital for a few months. Two days later, he said that his daughter was better. What should the bank teller do?
Return the money ASAP.
Having a sick daughter doesn’t justify theft, and the deed was wrong irrespective of the daughter’s recovery.
Therefore, the money should be returned to the account, and please G-d the daughter will continue to do well.
[The question is not entirely clear, because a dormant account is usually an account with no money and with no transactions; I assume the question refers to an account with money but with no transactions.]