He got it in 2020 and wants to send it back now? Please....
I'm the third one to notice that, that's a year of waiting and finding that guy, you are so rich if you did have the temptation to cash it out it's 3.8 BTC, I'll understand if it's only $300, but that's 3.8 that's $179k and if it was sent by mistake sending that huge amount the sender should be the one to look who he sent it to, if your story is true then he really meant to send it, you should post your screenshot because your story is incredible