Cardano sent to unknown wallet

Hey there! hope someone can help me about this problem. I’trying to solve a problem for a client. Actually he was trying to restore his wallet from the byron era to shelley era. During this process he achieved the ITN rewards but is cardano amount was sent to an unknown wallet: here the transaction: 8e4cae9326161e8522d17f3f26d0a80be858aad9adf8db698f9caa70e2236ba2. I think that he has actually lost his ada. Do you think that this amount is blocked for a reedem process?