You have good grounds to withdraw your bid. You must have documentation.The Orange County Board of Supervisors is seeking competitive sealed bids from qualified firms for. No Bid may be withdrawn in the 60 day period after the Bids are received. Permission for Bidder to Withdraw a Bid Due to a Mistake in Certain. Circumstances. 6.1 Bidders may withdraw their bid any time prior to the time of bid opening.