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Our eosDAC tool can help if you were part of the snapshot: https://eosdac.io/token_check/

There are other tools as well. Most wallets now have a lookup built in (like eos-voter by greymass)

Thanks for your reply but I still cannot find the owner and active public key...
I was indeed part of the snapshot and I took the time to vote for eosDAC as BP ;-)

NB: Just realized that owner and active public key = EOS public address :-)