Even closed they manage to be hacked again, like 2 months ago. If it continues there will be nothing left for Cryptopia's users...
This bothered me. I'm not saying I'm still counting on this whole liquidation process, but if an exchange is already put under liquidation and the funds in no less than its cold wallet are still being attacked, what hope is there left for the users? This is getting more and more ridiculous.
Anyway, OP, if you haven't received an email from the address mentioned by LeGaulois, try looking for it under spam. This was probably sent en masse to the claimants late last year. If there is none, you may proceed to
https://portal.cryptopia.co.nz/ and try creating an account there. You need to register so that you will be able to lodge your claim, or else you might lose your chance to recover your funds. You may also try reaching out to
https://cryptopia.zendesk.com/hc/en-us for further questions and clarifications.