This repo will hold information about the airdrops of D223 tokens, snapshots data and a scrip that was used to produce these snapshots.
https://github.com/EthereumCommonwealth/Dex223-crosschain-utilities/tree/main/lost_tokens contains a python script that calculates the amount of ERC-20 tokens lost because of this problem. It serves as a source of data for this page: https://dexaran.github.io/erc20-losses/