Idaho Code § 28-43-405
Except as provided by the provisions on retention of goods by the buyer, subsection (3) of section 28-43-404, Idaho Code, and allowing for ordinary wear and tear or consumption of the goods contemplated by the transaction, within a reasonable time after a home solicitation sale has been cancelled or an offer to purchase revoked, the buyer upon demand shall tender to the seller any goods delivered by the seller pursuant to the sale, but he is not obligated to tender at any place other than his residence. If the seller fails to demand possession of goods within a reasonable time after cancellation or revocation, the goods become the property of the buyer without obligation to pay for them. For the purpose of this section, a reasonable time is presumed to be forty (40) days.
Idaho Code § 28-43-405