How to dispose of a trust amount that increases every year, has been held for a long time, and whose owner is unknown?

Question:
A man bought a goat from me for ten riyals and left it with me to come back and take it, but he has not returned to take it until now, and that has been for more than thirty-eight years. I do not know him and I know nothing about him, and the amount has now become twelve thousand riyals. I want to get rid of this amount, so please inform us how to dispose of it?

Answer:
May Allah reward you. Give it to the poor and the needy, or to the mujahideen in the path of Allah in Afghanistan, or to the poor relatives, if there are poor among them, with the intention of the owner and its distribution. You are thanked and rewarded. May Allah bless you. Yes.