Returning library books

An original notice containing four intentional errors.

At the end of each day, the librarian check the returned books and places them on the sorting trolley. You will recieve a reminder before your books are due. Reader's may leave books in the marked box during opening hours. The assistant stores fiction and non-fiction seperately.

Proofread the notice. Identify the four errors and write the correct forms. Check the verb agreement, spelling and apostrophe use. There are two spelling errors, one apostrophe error and one verb agreement error. You do not need to rewrite the whole passage.