There are countless scams like this going on every day on the internet. The english and spelling in this one is better than the average and believe me I have declined hundreds of millions of dollars over the past few years to help someone get a "security chest"/inheritance of gold, cash, bonds whatever out of the country. The people who send these are very good at mass emailing thousands of people with one click. About once a year I hear of someone where I live falling for some sort of scam like this. If I remember correctly the last one cost this couple around $5,000.00. Was it P.T. Barnum that said "there's a sucker born every minute"? I just checked and as suspected the international dial code 234 is Nigeria where most of these scams originate. Remember if they get one sucker every year their take is multiple times the average annual income in Nigeria.
I checked the annual income in Nigeria and it is less than $700.00 US per year, get a damage deposit and first months rent of $1,100.00 USD and this guy is rich.
I can almost guarantee your son will now be getting "offers" on a regular basis from these people and their friends.