Question: how did the sword of gryffindor go missing?
Answer: How did Neville get the Sword of Gryffindor? In “Deathly Hallows,” Griphook the goblin claims that Godric Gryffindor stole his sword from the goblins and Griphook, in turn, steals the sword from Harry, Ron and Hermione in Gringotts.