Call me simple but I do0't understand a couple things. 1st of all, how was your friend's son out of any money if he cashed the check and has/had the money(3500$). 2nd who was the scammer? Was it the bank in which the check was issued? Was it a 3rd party? And 3rdly what did the scammer gain by doing it?
There's another old saying that goes, " You can't cheat an honest man ".
This is greedy stupid.