All of what you describe with regard to handling return statement mail can be described as control functions. Who "owns" these control functions in a bank will depend on history, culture, power trips, egos, effectiveness, and a lot of other variables.
Evidently, Audit at your bank is under the impression that you "own" this albatross and took it with you when you changed responsbilities. My personal view is that none of this is a Compliance matter, and really belongs to either Operations or Audit.
So, if your bank is still into "silos" of responsibility, find a way to sweep this control function out of your silo, if you can. You stated it best: You won't have the time to retain this responsibility.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8