If you send them their money back, I believe that this will happen:
Soon after reimbursing them, your bank will realize that the initial deposit was a fraud. But your reimbursement was not. Therefore, you will loose your money that you "sent back", and the bank will at the same time remove their phony deposit from your account.
My advice is to ignore everything and wait for the bank to remove their "mistake".
In a year or two if that deposit still shows in your account, then I'd withdraw it and keep or spend it.
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