Negotiable instrument audit

I am looking to audit the negotiable instrument(s) at the home office where bulk inventory would be stored. I define negotiable instruments as (but not all inclusive)  Mutilated cash, debit cards, credit cards, money orders, gift cards, cashier’s checks, stored value cards, travelers checks, foreign currency or anything else of value.  I account for the inventory at the branch level but did not look at the home office. I want to look at the process from ordering to receiving to distribution to the branches.     Can anyone be of assistance?  Thank you