King James Version
And if thy brother be not nigh unto thee, or if thou know him not, then thou shalt bring it unto thine own house, and it shall be with thee until thy brother seek after it, and thou shalt restore it to him again.English Standard Version
And if he does not live near you and you do not know who he is, you shall bring it home to your house, and it shall stay with you until your brother seeks it. Then you shall restore it to him.New International Version
If the brother does not live near you or if you do not know who he is, take it home with you and keep it until he comes looking for it. Then give it back to him.