If the photos were taken by the auction house, the photos belong to the auction house, even if the coin is/was yours. You might be able to "buy" the non-exclusive copyright to the photos just by making it a condition of your submitting more coins for them to auction for you. Non-exclusive copyright means they can continue to use their photos, while they give you ownership of them too.
Then, you can transfer your copyright ownership to the CC, and make the whole world happy :)