43 CFR 5461.3: Total payment.

The total amount of the contract purchase price must be paid prior to expiration of the time for cutting and removal under the contract. For a lump sum sale, the purchaser shall not be entitled to a refund even though the amount of timber cut, removed, or designated for cutting may be less than the estimated total volume shown in the contract. For a scale sale, if it is determined after all designated timber has been cut and measured that the total payments made under the contract exceed the total sale value of the timber measured, such excess shall be refunded to the purchaser within 60 days after such determination is made.