If I were sending data "back home" I wouldn't be sending it to "England." I'll be honest, I wouldn't have the first clue who to contact, unless MI6 had contacted me and asked me for the information, which I doubt they would - I'd be honestly astonished if I'd ever done anything in my life interesting enough for them to even notice who I am, and I wouldn't have the first clue who to send it to unless they came to me. I doubt [email protected] is a valid place to send file dumps. The only "back home" that would be relevant to me would be my employer.
It is for the same reason that I asked whether the person copied the files to his own system or his employer's. No doubt this person has their own interest in computers and technology, and it's entirely reasonable to think that they would want the MIT CSAIL files for themselves, outside of any orders from their employer to copy the information.