Answer:
We have a number of Bankers' Threads users who have been willing to share sample policies from time to time, always with the caveat that any policy "borrowed" from another institution needs to be carefully adapted to reflect the actual policies of the policy-borrower before being implemented.
BankersOnline's Banker Store has a Regulation O policy template available for sale.
First published on BankersOnline.com 4/1/13