12 CFR 229.31 - Returning bank's responsibility for return of checks.
(1) Two-day/four-day test. A returning bank returns a check in an expeditious manner if it sends the returned check in a manner such that the check would normally be received by the depositary bank not later than 4:00 p.m. (local time) of -
(ii) The fourth business day following the banking day on which the check was presented to the paying bank if the paying bank is not located in the same check processing region as the depositary bank.
(i) Of similar amount as the returned check;
(ii) Drawn on the depositary bank; and
(iii) Received for forward collection by the similarly situated bank at the time the returning bank received the returned check, except that a returning bank may set a cut-off hour for the receipt of returned checks that is earlier than the similarly situated bank's cut-off hour for checks received for forward collection, if the cut-off hour is not earlier than 2:00 p.m.
(c) Settlement. A returning bank shall settle with a bank sending a returned check to it for return by the same means that it settles or would settle with the sending bank for a check received for forward collection drawn on the depositary bank. This settlement is final when made.
(f) Notice in lieu of return. If a check is unavailable for return, the returning bank may send in its place a copy of the front and back of the returned check, or, if no copy is available, a written notice of nonpayment containing the information specified in § 229.33(b). The copy or notice shall clearly state that it constitutes a notice in lieu of return. A notice in lieu of return is considered a returned check subject to the expeditious return requirements of this section and to the other requirements of this subpart.
(g) Reliance on routing number. A returning bank may return a returned check based on any routing number designating the depositary bank appearing on the returned check in the depositary bank's indorsement or in magnetic ink on a qualified returned check.