in the prince Ali rescue quest?, if so, you get soft clay and ask the girl to let u touch the key, then u get a mould and bring it to the guy that asks for the copy
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A copy of the Varrock Herald can be purchased from Benny in Varrock Square for 50 coins.
Buy it, get it from the Hill giants.
open the dragon chest in Taverley
It is used to open the muddy chest
Talk to the banker NPC in-game about your key, should give you the option.