As no one can know the details of your bank account and its balance, a superannuation has to be managed by yourself. You need to know which superannuation you join and what the balance is. If you do not know the details of your superannuation, it is as if you cannot withdraw your money because you do not know your bank details. Your employers who are required to pay your superannuation know the details of your superannuation. You have to ask your employers first.
By ATO system that we use, we may be able to obtain details of your superannuation. However it depends the situations and how long you have your superannuation