The standard CAP form contains a clause that you may destroy the forms after the seven year period of safekeeping. This is usually interpreted that you must destroy them in a “reasonable time” (one year as a rule of thumb) after the safekeeping period has expired “unless ordered otherwise by an Arbitrator”.

Though there are no official policies about this, some Arbitration rulings, especially a20090328.1 and the follow up a20090618.3, point in this direction. (source: Assurance Handbook)