this rule was created as a another safe measure for the DTCC so that they never get CMKXed again this does not apply to CMKX but for any future companies who want be the next CMKX imho
The Depository Trust Company IMPORTANT B#: 9641-06 DATE: April 28, 2006 TO: All Participants CATEGORY: Reorganization FROM: DTC Reorganization ATTENTION: Reorganization Managers SUBJECT: Worthless Securities To Be Deleted From Participants Accounts
"effective on or after the thirtieth day following the date of this notice":