Could someone help me translate this?

I know nothing about Spanish, and I need to create a sign that says "If you don't know where the books go, please put them here for reshelving." I've tried online auto-translation services, but when I translate it back into English, it always looks wrong. Could someone who knows what they're doing help me out?

Si no sabes adonde va cada libro, por favor dejalo aqui que alguien los ubicara en su lugar.

Si no sabe colocar los libros, por favor déjelos aquí para su archivo

and rephasing joselas: Si no sabes adonde va cada libro, por favor déjalo aquí que alguien los ubicará en su lugar.