For a country with such a massive population of deeply religious people, I cant understand why this is even a dilemma. Simply send it back to the wallet it came from with a note in the memo. No matter $216k or $21.60, the price of free money is relative to the integrity, honesty and guilt of the recipient. There is no such thing as free money, ever.
Decentralisation and Web 3 do not suddenly trample over morals and ethics.
Anyone who simply kept it is a low-life thief.