|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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These were gold keys owned by anyone who had a bank account at Gringotts Wizarding Bank, enabling them to unlock and withdraw from their vaults. Lower security vaults, such as the one belonging to the Weasley family, require only a key to open. Higher security, such as the one belonging to the Lestrange family or the one belonging to the Potter family, requires not only the key, but also a goblin employee to lift the security measure around the door.