It is extremely common for more conspiracy minded authors to state that Dumbledore, Hagrid and/or Molly held onto Harry’s Gringotts key for most of his school career. This contradicts the facts. Here is what actually happens each year:
Year 1 (PS5): Hagrid has the key, having retrieved it on Dumbledore’s instructions. He takes Harry to Gringotts and Harry accesses his vault for the first time.1 This is the only time someone else demonstrably holds Harry’s key on his behalf, and it is before Harry even knows the wizarding world exists.
Year 2 (CS4): Harry goes to Gringotts with the Weasleys. He is present in person and accesses his own vault while the Weasleys access theirs.2
Year 3 (PA4): Harry stays at the Leaky Cauldron for several weeks before term and visits Diagon Alley freely on his own, including Gringotts.3 There is no indication anyone else handles his key.
Year 4 (GF10): This is the one year where Molly appears to have his key. She asks him to leave his school list out, and he later finds a bag of his gold on his bed.4 The text does not explain how she came to have the key or whether Harry gave it to her.
Year 5 (OotP): Harry is confined to Grimmauld Place and does not visit Diagon Alley. Others purchase his school supplies.5 The text does not specify who retrieves his gold or how. This is the one year where we genuinely do not know what happened.
Year 6 (HBP6): Bill, as a Gringotts employee, retrieves gold from Harry’s vault for him because security has been tightened following Voldemort’s return.6 This is explicitly described as Bill using his position at the bank, not as him holding Harry’s key.
In summary: Harry personally visits his vault in years 1, 2, and 3. Molly handles his gold once (year 4). Bill retrieves gold once using his employee access (year 6). Year 5 is unspecified. At no point does the text support the fan fiction trope that Dumbledore or the Weasleys controlled Harry’s access to his money throughout his school career. The situation in fourth and fifth year to allow an interpretation that Dumbledore has/controls a second key that he provides Molly access to. If so, this second key is entirely off screen, and only tangentially inferable from the observed facts listed here. Since a fair number of these stories place Harry’s [wake up] moment in years three, four or five (and if year five, usually the summer before it), they almost always include a scene where Harry ponders how he did not have any gold third year, a direct contradiction of our canonical account, and accompanied by a strong resentment of Hagrid for taking said key, when we have no evidence of that.
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Mrs. J. K. Rowling. Harry Potter and the Philosopher’s Stone Bloomsbury UK (1997). Chapter 5, “Diagon Alley.”
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Mrs. J. K. Rowling. Harry Potter and the Chamber of Secrets Bloomsbury UK (1998). Chapter 4, “At Flourish and Blotts.”
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Mrs. J. K. Rowling. Harry Potter and the Prisoner of Azkaban Bloomsbury UK (1999). Chapter 4, “The Leaky Cauldron.” page 50.
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Mrs. J. K. Rowling. Harry Potter and the Goblet of Fire Bloomsbury UK (2000). Chapter 10, “Mayhem at the Ministry.”
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Mrs. J. K. Rowling. Harry Potter and the Order of the Phoenix Bloomsbury UK (2003). Harry does not visit Diagon Alley; supplies are purchased by others while he remains at Grimmauld Place.
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Mrs. J. K. Rowling. Harry Potter and the Half-Blood Prince Bloomsbury UK (2005). Chapter 6, “Draco’s Detour.”
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