Hi I apologise for the delay, getting a reply depends on the right expert in the right area of law being available at that time.
There are 2 aspects to your question
Your employer has been negligent in that the DBS form was sent to the incorrect address despite being told the right one. Your claim against your employer would be in contract, breach of your employment contract and tort, breach of the duty of care your employer owes to you. This is a civil law claim and you would have to show that "on the balance of probabilities" the misdirection of the DBS led to the financial loss and personal injury suffered. Showing this will be difficult as there are so many ways fraudsters can get our details these days. You may have to instruct an expert in fraud to show how and the costs of an experts report would exceed the value of your claim. As such I would not pursue this on the basis it is a claim that is too speculative.
If the police can trace the fraudsters they will start criminal proceedings,If the fraudsters are convicted the court can make a compensation order in your favour. So fingers crossed that they catch them.