Gollum's magic ring that makes him invisible was lost somewhere in the caves of the Misty Mountains. Bilbo stumbled upon it, put it in his pocket, and that's how it left Gollum's possession and began its new adventures in the War of the Ring.
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Bilbo put a letter on the spoons to Angelica so they were for her
After Gandolf has left and they think they will be lost in Mirk wood forever
He gained a great deal of gold and silver. And had a great adventure and made new friends. And he was much wealthier, but he lost the respect of many of the hobbits around him.
They were tired and hungry with no food or water. At least with the elves, they were fed.Because they had lost their way in Mirkwood and were on the brink of starvation.
don't trust the story in the hobbit, unless you have a first edition, Bilbo lies (how unhobbit like!) until gandalf gets the straight story several years later. The real story appears in LOTR.