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If you have reported all of this to the police, you need to also send copies of the police report to the bank. Also, you need to provide proof to the bank of when you reported the theft, since debit cards work different than credit cards and once debits are made it is much more difficult to get them back from the bank and you need to review your bank's policy on fraud from the debit card.
Additionally, of course you know you can use an attorney (as you are a company and must be represented by an attorney in all lawsuits, except small claims, in FL) and you can sue the ex employee for the money and if the bank violated their terms of service with you and failed to protect your account upon you reporting the theft to them you could potentially sue the bank as well for return of the funds. This is your civil remedy in this case.
You also need to discuss this with the police again to see what more they are doing on your case.
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