Chris,
Generally, an inquiry must be made whenever the face value of the bond, debenture certificate or the market value of the stock certificate exceeds $10,000. This purpose is to determine whether the certificate has been reported as lost, stolen or counterfeit. If a borrower pledges bonds, debentures or shares of stock as collateral for a loan, whether consumer, commercial or some other classification, the Bank must "inquire."
See
SEC-SIC MarkB