Interesting the Royal Australian Mint doesn't even pay face value for damaged coins.
The scrap value payable by the Mint is based on the lesser of face value and the average London Metals Exchange price, for metal components in the coin?s alloy, over the calendar month preceding the claim less a fee reflecting losses, handling and administration fees incurred by the Mint.
Alloy
scrap value payable / kilogram
cupro-nickel ( 5c, 10c, 20c & 50c )
$14.56
aluminium bronze ( $1 & $2 )
$10.50
February 2022 prices/ March 2022 redemption
Link: https://www.ramint.gov.au/mutilated-coin-processing-scrap-metal-value
The scrap value payable by the Mint is based on the lesser of face value and the average London Metals Exchange price, for metal components in the coin?s alloy, over the calendar month preceding the claim less a fee reflecting losses, handling and administration fees incurred by the Mint.
Alloy
scrap value payable / kilogram
cupro-nickel ( 5c, 10c, 20c & 50c )
$14.56
aluminium bronze ( $1 & $2 )
$10.50
February 2022 prices/ March 2022 redemption
Link: https://www.ramint.gov.au/mutilated-coin-processing-scrap-metal-value