I live in Florida. I received a postal money order for 3 thousand dollars as gift (“gift” is written in “memo” field of that money order). I believe, but I am not 100% sure, that he is the person whom I helped when he was in trouble while we both were visiting another country as tourists. A month after receiving the money order, when I tried to contact him to express thanks, he is unreachable. I sent a certified letter to the address given in that money order but it was bounced back. Can I safely deposit that money order in my bank account as if he sent a personal check, or will it create any trouble to me later on?