بسم الله الرحمن الرحيم
(Fatwa: 792/778/N=09/1436)
You may take passbook etc binding task from the bank directly or through someone else, it is allowable as it does not involve directly to interest dealing or helping in the same. It is lawful like the job of watchman or sweeper etc in bank.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
