All applications for the transfer of title of an undocumented vessel after a lien sale of such vessel under Article 4 (commencing with Section 500) of the Harbors and Navigation Code shall be accompanied by proof of the possessory character of the lien so that the department may be satisfied of the genuineness and regularity of the transfer pursuant to Vehicle Code Section 9915(b). For the purposes of such proof, “storage” means services rendered in the safekeeping of a vessel by a person not the owner who has a right of possession together with a duty to care for the vessel and may include mooring, berthage, wharfing and anchorage and rental of vessel trailer parking space done in the process of the storage of a vessel. “Storage” does not include the rental of mooring space or of vessel trailer parking space when there is no duty to keep the vessel safe when occupying such space. Costs of repair means all material and labor of a repairman when a vessel is put in his keeping for such purposes and may include costs of mooring, berthage, wharfing and anchorage and rental of vessel trailer parking space if such services are included in the repairman's cost of handling a vessel for the purpose of repairing it.