How to Return Money That Its Owner Has Lost

Question
Two people have been business partners since 2010, and the loss was due to one of them. He committed to returning the money to the other person, and they parted ways. He has not heard anything from him until now, and he has searched everywhere and on social media but could not find him. First, how is the money calculated with the change in currency? Secondly, what should he do in this case, as he wants to return the money to his partner but cannot find him?
Answer
I say, and with God's help: If the change in the process is excessive and significant, it should be calculated by value. If it is slight, it should be calculated as it is. You should keep the money for it in a special account until you find it and give it to him. If you fear death, you should give it as charity on his behalf. And God knows best.
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