(1) Prior to Bid Opening. When an invitation for bids is cancelled prior to bid opening, all bids received will be returned to bidders unopened, if submitted with a clearly visible return address. If there is no return address on the envelope, the bid will be opened to determine the source and then returned to sender.

(2) After Bid Opening. When all bids are rejected, the bids received shall be retained and become part of the City's permanent file.