I don't think it is possible for you and another person to co own and use one wallet, where as you don't know such a person, and neither is the wallet in question , a multisig wallet.

creating wallets cost absolutely nothing and would only take less than 5 minutes, it is an absolute stupidity for a hacker to keep using your wallet after hacking, he know you have access to the same wallet and that if he puts or leave funds stored on that wallet, you can and would withdraw it, for this reason, they can never use co use a wallet they already hacked with the owner of the wallet they hacked, its not possible.