Bali prosecutors have burnt all of the physical evidence used to convict Australian woman Schapelle Corby on drug trafficking charges, despite a planned appeal.

Corby is serving a 20-year sentence for importing marijuana.

The prosecutors have burnt the 4.2 kilograms of marijuana, the boogie board bag it was found in, the boogie board itself and Corby's flippers.

The prosecutors' office refused to save even a small part of the marijuana for DNA testing, should this become part of any future appeal.

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