If your brother does not live near you, or if you do not know who he is, you are to take the animal home to remain with you until your brother comes seeking it; then you can return it to him.
Jewish Publication Society of America Version (JPS1917) - Deuteronomy 22:2 >And if thy brother be not nigh unto thee, and thou know him not, then thou shalt bring it home to thy house, and it shall be with thee until thy brother require it, and thou shalt restore it to him.