You can't. Non-refundable deposit is a lease contract. If negotiation fails, you can bring a lawsuit to solve it. Selling other people's things will constitute theft or embezzlement. If the amount is more than 3,000 yuan, criminal responsibility shall be investigated and punished. Deposit means that one party pays a certain fee to the other party to ensure that its behavior will not harm the interests of the other party. If damage is caused, he can pay the expenses according to the facts or make compensation separately.