Identification of goods as goods to which a lease contract refers may be made at any time and in any manner explicitly agreed to by the parties. In the absence of explicit agreement, identification occurs
(1) when the lease contract is made if the lease contract is for a lease of goods that are existing and identified;
(2) when the goods are shipped, marked, or otherwise designated by the lessor as goods to which the lease contract refers if the lease contract is for a lease of goods that are not existing and identified; or
(3) when the young are conceived if the lease contract is for a lease of unborn young of animals.