(1) Prior to the opening of the bidding window for the auctioning of two-day spot or five-day futures, the auctioneer may only be required to give allowances as collateral to be held in escrow by the clearing system or settlement system acting as custodian, pending their delivery.

(2) Where any allowances given as collateral under paragraph (1) are not used, the clearing system or settlement system may retain them in a nominated holding account held in escrow by the clearing system or settlement system acting as custodian, pending their delivery.