Русско-англо-русский юридический словарь

Property is generally deemed to have been abandoned if it is found in a place where the true owner likely intended to leave it, but is in such a condition that it is apparent that he or she has no intention of returning to claim it. Abandoned property generally becomes the property of whoever should find it and take possession of it first, although some states have enacted statutes under which certain kinds of abandoned property – usually cars, wrecked ships and wrecked aircraft – escheat, meaning that they become the property of the state. (Wikipedia)

Lost, mislaid, and abandoned property are categories of the common law of property which deals with personal property or chattel which has left the possession of its rightful owner without having directly entered the possession of another person. (Wikipedia)