How do I find the overdrawn balance on my old bank account?

From your old bank statements

I don't have the statements any longer. If I did I would not be in need of this website. Thanks though

I pretty much figured that. But my point in providing such a brief answer was that you posted such a brief question. Without knowing the situation it is very hard to provide advice. Maybe, if you explained WHY you need the statements and what your actual situation is, we may be able to help further. The more you put into your question the better we can answer. But be careful to not go overboard and put too much info.