63. Unless a purchaser indicates otherwise, a guarantee submitted in accordance with subparagraph b of subparagraph 2 of the first paragraph of section 59 that is not used during a sale by mutual agreement is retained for future sales by mutual agreement.
When a guarantee has been partly used, the remaining part may be used for a later sale by mutual agreement provided it is equal to or in excess of the amount of the offer to purchase submitted by the purchaser.
The guarantee submitted for a sale by mutual agreement may also be used for an auction when the amount of the guarantee is equal to or in excess of the total of the offers to purchase submitted in accordance with this Division and the bids submitted in accordance with Division III of this Chapter.