What did Bilbo do with the keys after he freed the dwarfs?

After Bilbo freed the dwarves from the Elvenking's prison, he kept the keys as a reminder of their escape and the adventure they shared. He later used them to help unlock their way out of the dungeons. The keys symbolized his growth and newfound bravery as a burglar, marking an important moment in his journey. Ultimately, they served as a token of his cleverness and resourcefulness in challenging situations.