GOOGLE HAS THE ANSWER.If you can find its make, model, and year manufactured on the box and google it, you'll probably find a result to how much its worth. From the looks of it, 500$ seems to be the most you can get out of it.
there's no info i can find, but i haven't checked behind the screwed in back panel but im afraid to.
http://www.liveauctionworld.com/Meilinks-Home-Deposit-Vault-Safe_i7229438