When Sirius approached a teller’s desk, he gave the goblin a note from the headmaster that he wanted to have the philosopher stone. The goblin was restraining a smirk, but led the two idiots to the vault 713. When they arrived to the vault, Sirius went to the vault alone and took the stone into his pocket. John didn’t notice the stone and when he asked, what was inside. Sirius just said that it was something that the headmaster wanted to keep a secret. John wanted to ask more, but his godfather gave him a look, where he stopped to ask any questions, but Sirius was sure that John would investiagte it with his friends.