In "Hamlet," what does Polonius give to Ophelia In Act 3?

At the beginning of Act 3, Polonius gives Ophelia a book of devotions so it will seem like she is alone because she is reading and meditating. He also tells her to return all the gifts that Hamlet had given to her. The plan backfires, Hamlet becomes angry and tells Ophelia to "get thee to a nunnery". Obviously, Polonius misjudged the situation because Hamlet certainly does not seem to be in love with Ophelia by the end of this scene. Perhaps, Hamlet suspects that he is being watched because he asks Ophelia where he father is. However, poor Ophelia takes the brunt of the punishment for her father's plan.