As I understood from what was written above, only a few types of coins were stolen, which makes it difficult for traders to withdraw untouched coins by criminals, or to give such an opportunity in the near future, and now provide information on balances? I think that the system is able to make a reliable assessment of the state of finances in a few minutes.
An example of four months ago with the CryptoHub exchange in a similar situation was resolved more safely. Within three days, the site published information on the degree of losses and presented a form for each account on the balance and desired addresses for the withdrawal of coins, made all payments in two weeks, 100% for safe deposits and 70% of the lost.