Ruling on returning money that was lost twenty years ago

Question:
He says: Honorable Shaykh, may Allah grant you success, ten riyals fell from a man twenty years ago. It was for the household expenses. Ten riyals fell from a man twenty years ago, and I took them and did not accept them, and I was ignorant. It fell from a man, meaning from a man, yes. And I took them and did not inform you, and I was ignorant, and this man is still alive. So do I return the ten riyals, or do I add to it because these ten were from twenty years ago and have a greater value? After the crisis. Yes, this is the question. Honorable Shaykh, may Allah preserve you, ten riyals fell from a man twenty years ago, and I took them and did not inform him, and I was ignorant, and this man is still alive. So do I return the ten riyals, or do I add to it because these ten were from twenty years ago and have a greater value?

Answer:
Yes, it is obligatory for you to return it to him or to seek his forgiveness. If he forgives you, there is no harm. But if he does not forgive you, you return it at its current value at the time of return.